Use the bike geometry calculator to determine the impact of a number of geometry modifications including installation of anglesets, changing wheel sizes, fork travel or offset, and installing an extended crown race or lower headset cup. Check the “Include Cockpit Fit Measurements” button at the bottom of the form to view additional inputs and calculated measurements for optional bike fit comparison. Note that manufacturers usually round their measurements so the wheelbase, effective top tube, etc. calculated here are shown with decimal places not likely to be shown on the official geometry table. 

Want to compare the geometry and fit of multiple bikes? Check out the Multiple Bike Geometry Comparison Tool.

Click here for a figure demonstrating the geometry measurements included in this calculator. Read this blog post for tips on entering mullet (mixed wheel) bikes into the original geometry column. View the FAQ for more detailed information on how the calculator works.

The tool overlays the original bike in red and the modified bike in blue. The bike overlays look best on desktop computers.