A set of free online tools for designing, building and setting up bikes.
Whether you’re calculating spoke lengths for a custom wheel build, sketching geometry for a new frame, or dialling in the spring rate on a linkage suspension design, these tools are free to use with no sign-up required.
Spoke length calculator
Calculate exact spoke lengths for any hub and rim combination. Supports J-bend and straight-pull spokes, asymmetric rims, and custom ERD. Bike frame designer
Sketch and visualise custom bike geometry. Input reach, stack, angles and dimensions to generate a scaled frame drawing. Export your geometry as a .json file.
Calculate exact spoke lengths for any hub and rim combination. Supports J-bend and straight-pull spokes, asymmetric rims, and custom ERD. Bike frame designer
Sketch and visualise custom bike geometry. Input reach, stack, angles and dimensions to generate a scaled frame drawing. Export your geometry as a .json file.
Suspension spring calculator — coming soon
Work out the correct spring rate for your suspension setup. Enter rider weight, leverage ratio and desired sag to find the right coil or air spring spec.
Work out the correct spring rate for your suspension setup. Enter rider weight, leverage ratio and desired sag to find the right coil or air spring spec.
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Feedback and suggestions welcome via the contact page.