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In eu mimimun ground clearance for vehicle is 80mm and you cannot build higher speed bumbs than that as all legal cars need to be able to go over. For curb heigths there migth be more sizes for curbs but most are around that 100mm. Usually stock car flaps have about 120-150mm clearance to ground on cars I have measured for the R&D process. What also matters is the distance to the wheel. When flap starts to bend 90 degrees will it touch the tire or not.
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