Not permitted, not listed in the rules 17 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Driveline
Adjustable or rider-controlled trim tabs
IHRA answers this part for 29 of its classes. 9 of those answers are permissions, with or without limits attached, and 20 are not. 20 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
29 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
Legal, within limits 2 classes
Aftermarket FIXED-POSITION only. Limits: max extension 100 mm.
- Ski 1100 Modified · R.5.2
- Ski 1500 Modified · Q.5.2
Legal, within limits 1 class
Aftermarket fixed-position tabs only, with manual and automatic tabs and transom hull extensions prohibited, extending no more than 100 mm. · U.5.1
Legal, within limits 1 class
Aftermarket fixed-position tabs only, with manual or automatic tabs attached to the hull prohibited, extending no more than 100 mm. · BB.9.2
Legal, within limits 1 class
Fixed-position only. Manual or automatic trim tabs prohibited. Transom extensions count as trim tabs. Limits: max extension 100 mm. · T.5.1
Legal, within limits 1 class
Fixed or movable, with actuation hardware. Must not exceed the width of the planing surface. Limits: max rear extension 100 mm. · CC.4.2
Legal, within limits 1 class
Fixed, automatic or rider-controlled, extending no more than 100 mm. · K.7.1
Legal, within limits 1 class
Automatic and rider-controlled allowed. Limits: max extension 100 mm. · V.8.1
Legal, within limits 1 class
Fixed, automatic or rider-controlled, extending no more than 3.94 in. · X.6.2
No rule, this is an open class 3 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, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
Adjustable or rider-controlled trim tabs: 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 · signed checks on parts the shop sells.
Driveline · two and four stroke · legal outright in 9 of 29