Not permitted, not listed in the rules 2 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Hull and handling
Aftermarket seat cover, IHRA
IHRA answers this part for 18 of its classes. 4 of those answers permit the part outright and 10 permit it with stated conditions, leaving 4 that do not. 2 of the ones that do not are classes we read as open rather than as refusing it. 4 are inferred from how the class is written rather than quoted from a rule naming this part.
This page is IHRA only, and the bodies do not agree. The same part under UIM. Which one applies to you is decided by whoever sanctions the race you enter.
Where it stands, class by class
18 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 permitted, not listed in the rules
- Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.
- 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.
- No rule, this is an open class
- Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.
Legal, with conditions 2 classes
Seat height may change by no more than 12.7 mm and the cover may be no thicker than 12.7 mm.
- Runabout Lites · AA.5.2
- Runabout GP3 · Z.10.2
Legal, with conditions 2 classes
OE seat base must remain in use, with height change and cover thickness each limited to 12.7 mm.
- Runabout GP2 · Y.7.2
- Sport Spec · U.6.1
Legal, with conditions 1 class
Aftermarket covers are allowed if they keep the original seat shape, stay within the height limit (50 mm, or 12.7 mm either way on the 2021 RXP-X) and create no hazard. · W.7.5.2, W.7.5.3, W.7.5.4
Legal, with conditions 1 class
The seat must be OEM, but modifications are allowed, read here as taking in a replacement cover. · DD.11
Legal, with conditions 1 class
The seat must be OEM with no open holes, and both seats fitted where the craft had two, but modifications are permitted, read here as taking in a replacement cover. · DD.1
Legal, with conditions 1 class
The seat must be OEM with no open holes, and both OEM seats fitted where the craft had two, but modifications are permitted, read here as taking in a replacement cover. · DD.2
Legal, with conditions 1 class
Only the seat base must be OEM, and modifications are permitted, so the cover may be replaced. Only one seat is required. · DD.3
Legal, with conditions 1 class
The seat must be OEM, but modifications are permitted, read here as taking in a replacement cover. · DD.4
Legal 1 class
Seat covers can be replaced, and the seat assembly may be aftermarket or modified, subject to guidelines for aftermarket seats that the held text does not define. · BB.10.1
Legal 1 class
Aftermarket seats are permitted, which takes in the cover. · DD.5
Legal 1 class
Aftermarket seat covers and padding are allowed, and seat height may be modified. · V.9.3
Legal 1 class
The whole seat may be aftermarket or modified, which takes in the cover, subject to guidelines for aftermarket seats that the held text does not define. · X.7.2
No rule, this is an open class 2 classes
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, 2 Stroke Unlimited · DD.12
- Drag, Unlimited · DD.6
Aftermarket seat cover: 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 IHRA 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 14 of 18 answered, 10 with conditions