Not legal 1 class
Hull extensions and trim tabs may NOT be used in Ski Lites, though mounting brackets may remain. · SKL.2.7
IJSBA · Hull and handling
Aftermarket FIXED-position trim tab / ride plate extension, IJSBA
IJSBA answers this part for 20 of its classes. 11 of those answers permit the part outright and 7 permit it with stated conditions, leaving 2 that do not.
Universal: max 100mm (3.94 in) rearward beyond the original planing surface, width may not exceed the planing surface, all edges radiused. Transom extensions count as trim tabs.
Where it stands, class by class
20 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
What each answer below means
- Not legal
- This comes off. The rules refuse it in this class.
- The rules do not say
- Unanswered. The rules do not settle this, so ask the club before you rely on it.
- Legal, with conditions
- Keep it, but measure it: the rules permit this part only inside stated limits.
- Legal
- Keep it. The rules permit this part in this class.
The rules do not say 1 class
Not addressed. Treat as OEM only unless Stock Class provisions permit otherwise.
- Vintage Ski Limited · VSKL
Legal, with conditions 3 classes
Replacement trim PLATES only, replica parts offering the same handling characteristics as stock. Material may differ from OEM.
- Fixed Steering Ski Stock · FSSK.2.6
- Ski Stock · SSK
- Four Stroke Ski Lites · FSKL.2.6
Legal, with conditions 2 classes
Replica plates only.
- Runabout Naturally Aspirated · RNA
- Runabout Stock · RAS
Legal, with conditions 1 class
Replica plates only, trim motors must remain in place.
- Runabout Rec Lites · RRL
Legal, with conditions 1 class
Replica trim plates only.
- Ski Superstock · SKSS
Legal 4 classes
Aftermarket trim tabs of any kind may be used, fixed ones included, no wider than the planing surface and reaching no more than 100mm (3.94 in.) past its end.
- Freestyle · FREST.2.7
- Ski Grand Prix · SKGP.2.7
- Sport GP · SPGP.3.6
- Runabout Open / GP · ROP.3.6
Legal 3 classes
Fixed-position only.
- Sport Spec · section headings, no numbered rules
- Runabout Limited · RAL.2.6
- Runabout Superstock · RSS
Legal 3 classes
Aftermarket fixed-position trim tabs may be used, no wider than the planing surface and reaching no more than 100.00mm (3.94 in.) past its end.
- Vintage SC · VSC.2.7
- Vintage X2 · VX2.2.7
- Vintage Ski · VSK.2.7
Legal 1 class
Aftermarket FIXED-position trim tabs allowed. · SKM.2.7
Aftermarket FIXED-position trim tab / ride plate extension: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every IJSBA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.
Hull and handling · two and four stroke · legal in 18 of 20 answered, 7 with conditions