About 159mph. Top speed depends on a lot of things: rider weight, gearing, tire profile size..even when i raced i swear wearing a different style helmet coming out of turn#9 at willow springs into the wind i could feel the pressure building up and especially if you don't tuck down all the way...so if you weigh 200lbs, have a nice wheelie sprocket on the back with a real wide low profile cool looking race slick i'm sure you'll lose 10mph easy. so taking the avg. probably about 154mph. and then don't forget about speedo error of usually 3% at the high end, so this all works out to @ 150mph true speed. Not bad for a 12 year old bike!
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