Front Gear
Rear Gear
Tire Size
Gear Ratio
Gear Rollout 
Rider Height
Rider Weight
Rider Inseam
Frame Size
15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.25 21.5 21.75 22
Crank Length
140 145 150 155 160 165 170 175 180 185 190
Wheel Size
Top tube Head tube Down tube Bottom bracket Chainstays Seatstays Seat tube Rear dropouts
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Bike Component Sizing Calc
To help you get the most of your bike and BMX racing SPR is happy to provide some tools to help you select the right size components for you.

It will help to give you a starting point for selecting what size frame, crank arms, wheel and basic gearing.

All riders are different so if longer cranks work better for you or you prefer a slightly shorter frame, then do what is right for your riding. We just want to give you a good idea of where to start.

So whether it's a new ride or just some new parts, we want the best fit for you.