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BMX Gear Calculator

Want to get to the optimal gearing? This tool will help you determine the tire, chainring, cog combos that will get you to a specific rollout.

Follow the 4 steps below to see which combos will work for you.

Target Gear Inch Range

Step 1: Select the range of gear inches you are looking for.

Min: Max:

Tires

Step 2: Select the tire size and check off one or more specific tires.

Tire Size:


Step 3: Select chainrings and cogs you have.

Front Chainring

Show Decimals

Rear Cog


Results

Step 4: Review all the combos that get you into the range you selected.

Gear Inches Tire Front Chainring Rear Cog


Step 5: If you need more chainring options Ebay has lots of Rennen Chainrings.