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Bike Wheel Size Calculator . Frame size guide for mountain bikes (mtbs) mountain bikes are generally designed to be more comfortable. To calculate your bike frame size, take your inseam in centimeters and multiply it by 0.575 for mountain bikes, 0.665 for road bikes, and 0.645 for trekking bikes. Mountain Bike Rim Width Tire Size Calculator from ridetvc.com Conversion tables for common bicycle tire sizes: See the kids bike size chart on the next page, when you've clicked entered the age and. Enter the wheel size, tire size, number of chain rings, number of teeth, select a cassette size (and optionally the individual cogs) and this tool will help you figure out how much easier or harder your gearing will be if you switch it or buy a new bike with different gearing that your current.