Bike tire pressure calculator
Get a practical starting pressure for road, gravel or MTB riding.
OpenCore tools
Bar and PSI converter
Convert tire pressure between bar and PSI.
OpenBike gear calculator
Compare gear ratios, rollout and speed at a selected cadence.
OpenSpeed from cadence
Calculate speed from wheel circumference, gearing and cadence.
OpenChain length calculator
Estimate chain length from chainstay and largest chainring and sprocket.
OpenBike frame size calculator
Estimate a starting frame size from height, inseam and bike type.
OpenSaddle height calculator
Calculate a starting saddle height using the LeMond method.
OpenE-bike range calculator
Estimate range from battery capacity and energy consumption.
OpenE-bike charging time
Estimate charging time from battery capacity, charger current and losses.
OpenBike maintenance cost
Summarize annual costs and cost per kilometre.
OpenWheel circumference calculator
Calculate wheel circumference from rim and tire dimensions.
OpenBike and luggage weight
Add bike, luggage and accessories weight.
OpenAd placement