Every bike conversion in one place — gearing, speed, tire sizes, and going electric.
Estimates for planning only — real numbers vary with rider weight, terrain, wind and tire pressure.
Free bike converters plus plain-English e-bike conversion guides. Calculate gear ratios, gear inches, cadence-to-speed, tire sizes and mph/km-h, then learn how to convert any bike to electric with the right motor kit, battery and the law on your side.
Read our guidesHub motor vs mid-drive, battery sizing, what it costs, and the legal watt and speed limits — everything to convert your bike to electric.
Read more →A practical comparison of the two main e-bike conversion motor types — cost, hills, range, maintenance and resale.
Read more →What gear inches, gear ratio and development actually mean, and how to use them to compare any two bikes.
Read more →Decode the confusing world of tire markings — ETRTO, inch and French sizing — and find what fits your rim.
Read more →