Racing

History · 2002 to 2025

How the IJSBA classes changed, 2002 to 2025

In plain words. Follows how the IJSBA arranged and renamed its racing classes, edition by edition, from the 2002 rule book to today's separate class documents. It covers the four tiers from Stock to Modified, the horsepower-capped Lites classes and the changes proposed for 2018, but it reads rules only, so it cannot say which classes were raced or by how many.

The IJSBA never published a history of its own classes. This chapter reads the rule books held here, from the complete 2002 book to the twenty class documents on the current rule book page, and records what each edition printed about the ladder, the homologation figure, and the rules that never moved.

Words on this page (4)

Mod Lites: Short form of Ski Mod Lites as the 2018 document writes it
Runabout Lites Class: The name the IJSBA Runabout Rec Lites rules use once, in RRL.1, for the class when they list the two models eligible as of January 1, 2021. The IHRA rulebook has a separate Runabout Lites class in its section AA.
Ski Lites: An IJSBA ski class meant to promote ski racing at a baseline level with modest investment and maintenance costs, open only to the Kawasaki SX-R and the Yamaha SuperJet with two-stroke engines, and capped at 850cc.
Superstock Addendum: A paragraph of the Open Class rules in the 2010 IJSBA book: a class designated Superstock runs under Open Class rules except 8.2.2 on aftermarket hulls and 8.3.5.a on aftermarket cylinders. Superstock was NOT introduced in 2018. The pending 2018 change list proposed that Runabout Open be replaced with Superstock, and the 2016 Displacement Guide had already printed the heading Runabout Open (Superstock).

The ladder in the 2002 book

Confirmed

The 2002 book is the oldest complete IJSBA rule book held here. Its contents page runs the technical rules as four numbered parts, 6 Stock Class, 7 Limited Class, 8 Superstock Class and 9 Modified Class, and part 5 of the 2002 book names the three racing divisions as Ski, Sport and Runabout. The homologation rule in part 4 of the 2002 book requires a manufacturer to produce a minimum of 500 identically manufactured units of a model, or 200 for the Ski Division, and to sell them through its normal means of distribution. The class list printed in the 2002 book's United States section pairs each part with a displacement, Ski at 550, 650 and 800, Sport at 650 and 800, Runabout at 660, 800 and 1200, so a full class name reads as a rider tier, a division, a displacement and a part, for example Expert Runabout 1200 Superstock. The rider tiers in part 10 of the 2002 book are Beginner, Novice, Expert, Amateur (defined as Novice and Expert combined), Pro, Pro-Am, Veterans, Masters and Women. No glossary entry defines Stock, Limited, Superstock or Modified. The 2002 glossary defines Homologation, Replacement Part and Replica, but not the tier words. What the tier words meant operationally is set by one sentence that opens every part of the 2002 book, that the watercraft must remain strictly stock except where rules allow or require substitutions or modifications, followed by "Changes not listed here are not permitted." Each part is a longer list of permitted changes than the one before it, and the tier word is the label on the list. In the 2002 book Stock keeps the exhaust as supplied and confines engine work to boring, replacement pistons and a rebuilt crankshaft; Limited opens the carburettors, cylinder head, exhaust pipe and ignition timing but keeps the original pump housing; Superstock adds port work, aftermarket pistons and a modified pump housing; Modified allows an aftermarket crankshaft, cylinder and hull within the length and width of the original upper bond flange.

Sources: 2002 rule book

What the 2006 and 2010 books add

Confirmed

The next held text is a Hungarian affiliate's translation of the 2006 book, used here only for its part headings and its class table, because a translation is not the sanctioning body's wording. Its contents page keeps the four parts but heads part 8 as SuperStock (Open), and its class table adds four-stroke Runabout classes at 1100 and 1600 in Stock and Superstock (Open) tiers with Turbo variants. That is where the word Open enters the held set. The 2010 book, the next complete English text, heads part 8 as Open Class outright, with Superstock reduced to an addendum stating that Open Class rules apply minus aftermarket hulls and aftermarket cylinders; its class list prints Ski Open and Runabout Open beside Modified/GP, carries a Four-Stroke Runabout section, 5.5, which the 2006 translation already heads, and names Vintage Ski, 550 Superstock and X2 as alternative classes to ask the IJSBA about. The 2011 change log then bars Novice licence holders from Open, Modified and GP classes wherever forced-induction runabouts are allowed. On homologation the held books print two figures at once. Part 4 of the 2010 book sets the homologation figure at 500 units with no Ski exception, and adds a route for models produced in quantities below 500, a minimum of 100 units with 50 more to be built if the first 100 sell before July 1. The appendix of the 2010 book adds a Special Production route below 100 units at a 25-unit minimum, eligible only for a controlled Special Production Stock Class and the Modified/GP classes. Yet the competition-classes appendix of the same 2010 book, and of the 2011, 2012, 2014 and 2015 books, still prints the 2002 wording, 500 with 200 for the Ski Division. Our Wayback capture index dates the change from captures not read here, 500 and 200 to 2006, 500 flat from 2007, the 100-unit route from 2008, while the 2006 translation already prints 500 with the 100-unit route. Which is right cannot be settled from the texts held.

2006 book in Hungarian translation says: Its homologation chapter, as translated, requires 500 identically produced units with no Ski Division exception and already carries the route for models below 500 at a 100-unit minimum.
Wayback capture index says: The index dates the threshold from the unread English captures as 500 units with 200 for the Ski Division to 2006, 500 flat from 2007, and the 100-unit route from 2008.

Sources: 2012 rule book; 2006 book in Hungarian translation; 2010 rule book; 2011 rule book; 2011 rule changes; 2014 rule book; 2015 draft rule book

The Lites addendum, from the 2010 book to 2014

Confirmed

Lites is not a fifth part. The 2010 book carries it inside the Stock Class part as an addendum, and defines it in one sentence, that LITES is a special designation applied to Stock Classes to implement a horsepower limit. In the 2010 and 2011 books Ski Lites are Stock Class Ski PWC with a maximum of 85 horsepower as furnished by the manufacturer, Runabout Lites are Stock Class Runabout PWC with a maximum of 220 horsepower, and the IJSBA undertakes to publish an official list of OEM horsepower for homologated models. The 2012 book keeps the 85 horsepower Ski figure and redefines the runabout side, so that Runabout Lites become four-stroke, normally aspirated Stock Class runabouts under 2000cc, with two-stroke runabouts under 1300cc built to Limited specifications admitted. The 2014 book renames that class Runabout Rec Lites, and its class list caps it at 950cc four-stroke and 735cc two-stroke. The same addendum grants promoters naming latitude. The class naming addendum of the 2010 book, repeated in the 2011, 2012 and 2014 books, says a promoter may rename classes to describe the bulk of participation, and gives the example that where Lites type Ski are more prevalent the promoter may name the Lites class Stock and the non-Lites class Performance Stock or Four Stroke Stock. That sentence matters to anyone reading old results, because a class printed as Ski Stock at one event may have been an 85 horsepower Lites field at another. The 2012 book also dates one change to itself, that as of 2012 all 500-unit Ski PWC eligible for the Lites class are allowed a second set of sponsons for a total of four, where the 2010 book had granted the fourth sponson only to 500-unit models whose hull had gone more than five years without an update. In the class lists of the 2010 and 2011 books Ski Lites is printed first in the Ski ladder, ahead of Ski Stock, Ski Limited, Ski Open and Ski Modified/GP.

Sources: 2010 rule book; 2011 rule book; 2012 rule book; 2014 rule book

The 2018 rewrite, read from the pending change list

Confirmed

The held 2018 document is IJSBA's posted list of pending rule changes to the 2018 competition program, written before the Board of Directors ratified it, with the 2016 book's text behind it in the same file. Its runabout list has four lines. Runabout Stock is to allow aftermarket valve retainers. Runabout Limited has no changes. Runabout Open reads "To Be Replaced With Superstock and Runabout Open to be merged with Runabout Modified/GP". Runabout Modified/GP has no changes, and the list says it will continue to exist as a Saturday class at the 2018 World Finals, while Sunday will offer Runabout Superstock, defined as a Limited Class runabout plus an aftermarket hood and an aftermarket forced induction system. That is a rebase. In the 2010 to 2016 books Superstock was an addendum to Open, Open rules minus aftermarket hulls and cylinders; from the 2018 list it is Limited plus two items. The ski list runs to seven numbered class lines, followed by three numbered Mod Lites provisions. Ski Lites and Ski Stock have no changes. Ski Limited has no changes but "will be kept as a class description in addendum", and at World Finals will be replaced by Mod Lites. Ski Modified and Ski GP are to be merged into a class built around the two-stroke three-cylinder machines the list calls the core of the program, with naturally aspirated four-strokes limited to 1100cc and forced-induction four-strokes to 900cc unless a speed control device holding 65 mph is developed. Ski Superstock is "intended to be a class that services, primarily, the existing 2018-2019 Kawasaki SX-R", taking Ski Stock provisions plus aftermarket camshafts, valve systems, hood, ECU, propulsion pump and water routing. Ski Mod Lites "will begin in 2018 as a pilot program" serving the aftermarket industry, allowing aftermarket hulls and two-stroke or four-stroke homologated engines, and the list states that Mod Lites will generally replace Ski Limited and that Junior 13-15 Limited changes to Junior 13-15 Mod Lites on ratification. The move from numbered parts to per-class documents is not announced in the list; it shows in the current rule book page, where every class is a separate PDF with a letter prefix, against the numbered parts 6 to 9 of every held book from 2002 to 2015; the 2016 text already splits by division, Runabout chapters 6 to 8 and Ski chapters 10 to 13.

Sources: 2015 draft rule book; 2014 rule book; 2012 rule book; 2011 rule book; 2018 pending changes and 2016 book; 2010 rule book; IJSBA rule book page

The current set, 2021 to 2025

Contested

The rule book page at ijsba.com links no single book. Read on 2026-09-28, it lists per-class PDFs of differing years, eleven dated 2025 (Ski Stock, Fixed Steering Ski Stock, Four Stroke Ski Lites, Ski Superstock, Ski Grand Prix, Vintage Ski, Vintage Ski Limited, Runabout Naturally Aspirated, Runabout Superstock, Freestyle and Sport GP), five dated 2024 (Ski Lites, Ski Modified, Runabout Stock, Runabout Open/GP and Sport Spec), one dated 2023 (Vintage X2) and three dated 2022 (Vintage SC, Runabout Rec Lites and Runabout Limited), twenty class documents in all, the set our class notes hold. Four of the twenty are vintage classes. Vintage Ski is built around the original Kawasaki 550 engine cases and hull; Vintage Ski Limited keeps those cases with the stroke and rod length fixed and inherits the Stock provisions; Vintage X2 admits only the 1986 to 1995 OEM X2 hull; Vintage SC only the 1991 SC hull, steered by a wheel rather than a handlepole. The Fixed Steering Ski Stock document covers the 1500cc Kawasaki fitted by the manufacturer with fixed steering instead of a handlepole, and its PDF prints the model as SX-X, a name no product carries. The page also links a Displacement Guide dated 2021, four years older than the newest class documents, and the two disagree. As this site's notes on the sanctioning body read it, the 2021 guide gives Vintage Ski a 650cc default where the 2025 Vintage Ski document sets 600cc; it gives Vintage X2 and Vintage SC 800cc where the 2023 and 2022 documents set 850cc; it caps forced-induction four-strokes in Ski GP at 900cc where the 2025 Ski Grand Prix document allows 1100cc; and it puts Runabout Rec Lites under 8,500 dollars where the 2022 Rec Lites document says 10,000. Those notes flag each conflict rather than choosing a side, and this chapter does the same.

2021 displacement guide says: The 2021 Displacement Guide, as this site's notes on the sanctioning body read it, gives Vintage Ski a 650cc default, Vintage X2 and Vintage SC 800cc, Ski GP forced induction 900cc, and Rec Lites a price ceiling of 8,500 dollars.
IJSBA rule book page says: The class documents the page links, as our class notes read them, set Vintage Ski at 600cc (2025), Vintage X2 and Vintage SC at 850cc (2023 and 2022), Ski Grand Prix forced induction at 1100cc (2025), and Rec Lites under 10,000 dollars (2022).

Sources: IJSBA rule book page; 2021 displacement guide

What held still across twenty-three years

Confirmed

Four things read the same in every held book from 2002 to 2016, and the current class records repeat them. The closed list. The 2002 book says changes not listed here are not permitted; the 2010, 2011, 2012, 2014, 2015 and 2016 books say changes or modifications not listed here are not permitted; and the current Stock, Limited, Superstock and Vintage Limited documents open the same way, which this site's notes on the sanctioning body call the governing principle, that silence means prohibited. The pump ratio. Where the 2002 book allows a modified driveline, in Superstock and in the Runabout 1200 Limited class, it requires couplers, bearing housing and driveshaft to maintain a 1:1 drive ratio between the engine and the pump; the 2010, 2011, 2012, 2014, 2015 and 2016 books carry the same clause, and three of the current IJSBA class records store it. The intake grate. Every held book from 2002 to 2016 requires a full-length grate with at least one bar parallel to the driveshaft, extending no more than 12.00mm below the flat plane of the pump intake, and our parts notes repeat 12.00mm for every current class; the current Ski Lites and Four Stroke Ski Lites documents, held as text and checked on 2026-10-02, print 11.00mm (0.47 in.) at SKL.2.4 and FSKL.2.4, the reading the two class records had marked as a conversion conflict, and this archive's copy of the 2018 rule-change text prints the same sentence at its 11.2.4. The sponson envelope. Each sponson no longer than 91.45cm, protruding no more than 100.00mm from the hull side, reaching no more than 38.00mm below the line where hull side meets hull bottom, and more than 6mm thick, reads identically in the 2002 book and the Stock part of the 2010 book; the 2010 Limited and Open parts print 63.5mm for the reach below that line. The one figure that moved is the vertical channel under the sponson, 38.00mm in the 2002 book and 63.5mm in the 2010 and 2012 books, and the count, two sponsons in the 2002 book and four for some Ski classes from the 2010 book. What never changed is also what was never defined. No glossary in the 2002 or 2010 book has an entry for Stock, Limited, Superstock, Open or Modified; the words are defined only by the lists beneath them, and since those lists lengthened in every edition, a Limited machine of 2002 and a Limited machine of 2016 are legal under different lists that share a name. The rider tiers are the same kind of label. The 2002 book states that the IJSBA does not test the skill of individual participants, and the current membership rules, as the body record reads them, say the same.

Sources: 2002 rule book; 2010 rule book; 2011 rule book; 2012 rule book; 2014 rule book; 2015 draft rule book; 2018 pending changes and 2016 book; IJSBA rule book page

Not covered, and why (8)

The homologation figure was 500 units through the 1990s.: The Master list marks the 1990s threshold as not established. The oldest held book is 2002, and it prints 500 units with 200 for the Ski Division; nothing earlier is held to say when either figure began.
Superstock was a 2018 pilot tier created between Limited and Modified.: Our research notes' ladder says so, but the 2002 book already carries Superstock as numbered part 8, the 2010 book carries it as an addendum to Open Class, and the 2018 list calls Mod Lites, not Superstock, the pilot program. The held texts win.
Ski Limited was rebranded Mod Lites in 2018.: The 2018 list says Ski Limited will be kept as a class description in addendum and that Mod Lites will generally replace it; a replacement with different engine and hull rules is not a rename, and the current page links no Ski Limited document at all.
Ski Lites, Ski 4-Stroke Lites and Vintage Ski (550) are the IJSBA ladder as a regional promoter's 2026 list shows it.: A promoter's class list is not a rule book. The 2010 book's class naming addendum lets a promoter call a Lites field Stock, so promoter names cannot be read back into the IJSBA ladder; the current page's own names are Ski Lites and Four Stroke Ski Lites.
The 2021 four-stroke SuperJet reshaped the entire ladder into a two-stroke and four-stroke split.: No held book states a cause for any class change, checked on 2026-10-02; the nearest thing is a purpose. The current Four Stroke Ski Lites document, held as text, opens at FSKL.1 "Intended to promote interest in contemporary Ski type personal watercraft competition, at a baseline level, on watercraft that are widely sold at through the common retail market", the Ski Lites document opens at SKL.1 with the same sentence without the word contemporary and without the retail clause, and each Vintage document opens with the model it is designed for. A purpose for a class is not a cause for a split, and none of them mentions the SuperJet or a two-stroke and four-stroke division. The current page links the Four Stroke Ski Lites document dated 2025 beside a Ski Lites document dated 2024, and that is all the texts show; the reshaping is our research notes' inference.
The Ski and Runabout split dates from 1986, and freestyle and endurance have founding dates as IJSBA disciplines.: Both are open Master list items. The 2002 book already has three divisions and separate freestyle and endurance event chapters, so the held texts give a latest date for each, never an origin.
The sport lost Runabout Open in 2018.: The 2018 list merges Runabout Open into Modified/GP, yet the current rule book page links a Runabout Open/GP document dated 2024, and the capture index notes a 2018 Open document still listed. The name survived whatever the list intended.
The 2018 Ski GP rules capped forced induction at 8 PSI under 900cc and 6 PSI above.: Our research notes give these figures; the held 2018 list caps forced-induction four-strokes at 900cc and speaks of a 65 mph speed control device, with no PSI figure. The 8 PSI and 6 PSI figures are printed in the 2021 Displacement Guide for Ski GP at 900cc and Ski Modified at 1100cc, an appendix dated three years after the 2018 list, so they cannot be read back into the 2018 Ski GP rules.

What could not be read (6)

Not held as English text: the 2003, 2004, 2005, 2007, 2008, 2009, 2013, 2017, 2019 and 2020 books. The Wayback capture index lists captures of the 2003 to 2009 books (2007 and 2008 complete), the 2013 parts, the 2016 to 2017 parts, and the 2019 general parts and Ski Grand Prix document, all cached locally and unread for this chapter; for 2020 the index holds no rule book capture at all, only a Sport Spec result sheet. A Hungarian translation of the 2005 book is held and was not used here, and the 2019 captures also include a Sport GP document.
The 2016 book is held only as the text that follows the pending 2018 change list in the jetski.cz file, and the 2015 text is a draft. The ratified 2018 per-class documents are in the capture index and were not read, so the 2018 section rests on the proposal, not the ratified wording.
The 2006 book is held only as a Hungarian affiliate's translation. It is used for its part headings and its class table and for nothing else; the English 2006 parts are in the capture index and unread.
No book before 2002 is held anywhere, and the capture index records that nothing on ijsba.com predates 2000. The homologation threshold of the 1990s is not in any held text.
The twenty current class documents and the 2021 Displacement Guide were not re-read for this chapter; their figures come from our class and body notes extracted on 2026-09-07 and from the rule book page read on 2026-09-28.
No result sheet was read, so nothing here says which of these classes were run in any year, or how many machines entered them.

Documents cited in this chapter

2002 rule book (web.archive.org): IJSBA 2002 Official Competition Rule Book, International Jet Sports Boating Association, 2002; sanctioning body, high. The complete 2002 book in 25 sections, the oldest full IJSBA rule book held here, served from a Norwegian club's document server and captured by the Wayback Machine. Four numbered technical parts (Stock, Limited, Superstock, Modified), three divisions, the 500 and 200 unit homologation figures, and the United States class list.
2012 rule book (web.archive.org): IJSBA 2012 Official Competition Rule Book, International Jet Sports Boating Association, 2012; sanctioning body, high. The complete 2012 book. Its Lites addendum redefines Runabout Lites as four-stroke naturally aspirated Stock runabouts under 2000cc, and its Ski sponson rule is dated to itself, as of 2012, for the four-sponson allowance on Lites-eligible Ski.
2006 book in Hungarian translation (web.archive.org): IJSBA 2006 rule book, Hungarian translation (MJSZ 2006 rule book part II), Magyar Jet-Ski Szovetseg, translating the International Jet Sports Boating Association, 2006; sanctioning body, medium. A national affiliate's translation of the whole 2006 book, not IJSBA's own wording, so graded medium and used only for its part headings and its class table, where the class names are printed in English. Two accented letters print as substitute characters in the extract. The English 2006 parts are in the Wayback capture index and were not read for this chapter.
2010 rule book (web.archive.org): IJSBA 2010 Official Competition Rule Book, International Jet Sports Boating Association, 2010; sanctioning body, high. The complete 2010 book, kept by the Czech affiliate after IJSBA removed it. Part 8 is headed Open Class with Superstock as an addendum; the Stock part carries the Lites and class naming addenda; part 4 prints the 500 unit figure without a Ski exception and the 100 unit route below it; the appendix adds Special Production homologation below 100 units.
2011 rule book (web.archive.org): IJSBA 2011 Official Competition Rule Book, International Jet Sports Boating Association, 2011; sanctioning body, high. The complete 2011 book from the Czech affiliate's server. Repeats the 2010 Lites addendum (85 and 220 horsepower) and the class naming addendum, and its competition classes appendix still prints 500 (200 for Ski Division) while its part 4 prints 500 flat.
2011 rule changes (web.archive.org): 2011 IJSBA Rule Book Changes, International Jet Sports Boating Association, 2011; sanctioning body, high. The itemised 2011 amendment log, motions as passed. Item 7 bars Novice licence holders from Open, Modified and GP classes where supercharged or turbocharged runabouts are allowed; items 1 and 2 open fuel tanks and replica top decks in Open and GP.
2014 rule book (web.archive.org): IJSBA 2014 Official Competition Rule Book, International Jet Sports Boating Association, 2014; sanctioning body, high. The complete 2014 book. Runabout Lites is renamed Runabout Rec Lites in the addendum, and the class list adds Vintage Ski (JS type hulls only, 550cc maximum), Sport GP and Runabout 1000 Superstock.
2015 draft rule book (web.archive.org): IJSBA 2015 Official Competition Rule Book (draft), International Jet Sports Boating Association, 2015; sanctioning body, high. A draft, as its file name says, so cited only where it repeats earlier books. Its class list is the 2014 list unchanged, Vintage Ski included.
Wayback capture index (web.archive.org): IJSBA documents recovered from the Wayback Machine (our capture index), BaddJet research, 2026-09-21; project research, low, held on file and not evidence. Our own table of Wayback captures of ijsba.com PDFs, with the capture URL of each, and its summary of the homologation threshold year by year from captures cached locally and not read for this chapter. Not evidence; a contested entry may point at it for the dating it records.
2018 pending changes and 2016 book (jetski.cz): Pending rule changes to the 2018 IJSBA Competition Program, with the 2016 Official Competition Rulebook text, International Jet Sports Boating Association, 2018; sanctioning body, high. The first 74 lines of the extract are IJSBA's posted list of pending changes to the 2018 competition program, written before the Board of Directors ratified them; the rest of the file is the text of the 2016 book (copyright 2016) with its 2016 Displacement Guide. Held live from the Czech jetski.cz server at pull time, not from the Wayback Machine. No signatory is copied from it.
IJSBA rule book page (ijsba.com): IJSBA Competition Rule Book (the current per-class documents), International Jet Sports Boating Association; sanctioning body, high. The live page, read on the accessed date. It links no single book but per-class PDFs dated 2021 to 2025, twenty of them class documents, plus general, competition and appendix documents. The class and body records on this site were read from these PDFs on 2026-09-07; the chapter's figures for the current set come from those records and from the page itself, not from a re-reading of the PDFs.
2021 displacement guide (ijsba.com): IJSBA 2021 Displacement Guide, International Jet Sports Boating Association, 2021; sanctioning body, high. The appendix document the current rule book page links as the Displacement Guide, dated 2021. Its figures are cited here as the body record on this site reads them, which also records where they disagree with the newer class documents.

Changes to this chapter

2026-10-02: The absence claim in the entry above was re-checked on 2026-10-02 against the texts held that day and no longer holds: the current Ski Lites and Four Stroke Ski Lites documents, held as text in the pit box since the rulebook check of 2 October 2026, print at SKL.2.4 and FSKL.2.4 that grates "may not extend more than 11.00mm (0.47 in.) below the flat plane of the pump intake area", and this archive's copy of the 2018 rule-change text prints the same sentence at its 11.2.4. The intake grate paragraph now says so, and the figure the class records had flagged as a conversion conflict is the books' own. The blocked claim on a cause for a class now records the purpose sentences the current class documents open with, which are not a cause.
2026-09-30: Source check against the held books: the 2002 Stock part allows boring, replacement pistons and a rebuilt crankshaft; Novice Ski 650 is on the 2002 list; the Four-Stroke Runabout section is in the 2006 translation already; the 2012 book also prints the 200-unit Ski figure and keeps the 500-unit qualifier on the 2012 sponson rule; the 2016 text is split by division, not numbered 6 to 9; no held document printed an 11.00mm grate on 2026-09-30 (corrected 2026-10-02, see the later entry); the 2010 Limited and Open sponson figure; the PSI figures come from the 2021 guide.

Cite this page

“How the IJSBA classes changed, 2002 to 2025”, BaddJet archive, https://baddjetarchive.com/racing/history/class-structure-2002-2025/

Add the date you read it.

Every chapter, or the same history era by era.

Previous chapter: Homologation, from race part to retail part
Next chapter: The current state: three bodies, 2024 to 2026

2002 to 2025 · 6 sections · 1 contested · 8 claims held back