Legal, with conditions Ski GP3 (archive) · IHRA · 2026 rulebook · J.18.1
The ride plate rule is universal across IHRA classes and names the Ski class directly, so it reaches GP3 unchanged: an aftermarket or modified plate is permitted, any extension may not exceed the original plate's width, and the plate may not extend more than 3.94 inches (100mm). Watch the interaction with M.6.2.1.1, which separately allows a SuperJet hull extension of up to 100mm beyond the original planing surface, because the two limits are measured from different places and a rider running both should check them together.
Checked against the rulebook on 2026-09-07, version V.20260603 ·
Read the rulebook, Ski GP3
Legal, with conditions Ski Lites (archive) · IHRA · 2026 rulebook · J.18.1
J.18.1 permits an aftermarket or modified ride plate. Extensions added to it must not exceed the width of the original plate, and for the Ski class an aftermarket ride plate must not extend more than 3.94 inches (100mm). All components must be free of hazardous edges, a condition IJSBA does not state in those words. Check the plate against a tape and against the original before you run it.
Checked against the rulebook on 2026-09-07, version V.20260603 ·
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Legal, with conditions Ski Lites (archive) · IJSBA · 2024 rulebook · SKL.2.5
IJSBA calls this component the pump cover plate, and SKL.2.5 permits a modified or aftermarket one. Three conditions apply and all are dimensional: a rear extension must not exceed the width of the original equipment plate, the plate must not extend more than 100.00mm (3.94 in.) beyond the end of the original plate, and fins, rudders, skegs or other appendages that may create a hazard are not allowed. The sides of any extension must connect to the radiused portion of the plate. Do not confuse this with a fixed trim tab or a hull extension, which are different parts governed by SKL.2.7 and may not be used in Ski Lites at all, and note that SKL.2.6 separately restricts trim plates to replicas matching stock handling. Measure the plate before racing it.
Checked against the rulebook on 2026-09-07 ·
Read the rulebook, Ski Lites