Cycling numbers, worked out exactly
Calculators that show their working, and news that gets to the point
Tools for the numbers riders actually need, and short technical news on the equipment those numbers describe.
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All news →Insidebike tools: frame geometry search and gearing comparisons
Search frame geometry across 22 brands, or compare two gearing setups by speed, gear gaps and modelled effort.
Schwalbe sets April 2027 retail date for its first 32-inch gravel tyres
Schwalbe's 32-inch G-One RS Pro and RX Pro need 686 mm rims and reach retailers in April 2027, in 50 and 55 mm widths.
Gear calculator update: pick drivetrains by tap, and gear steps in watts
The gear calculator now picks chainrings and cassettes by tap, rates each gear step in watts on a modelled gradient, and can compare efforts against your FTP.