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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Formulas for finding maxs speed
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[QUOTE="dirt bike dave, post: 719166, member: 18302"] Thanks for the forumla, James. Just checked my shop manual and the primary drive reduction for the '97-'99 CR250 is in fact 3.0 (the actual primary gears are 63/21). And as James showed in his example, your estimate of 21" rear wheel diameter is too low for a dirt bike tire. My bike has an 18" rear rim and the tire is approx. 27" in diameter. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Formulas for finding maxs speed
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