Every number on this site comes from a formula you can read.
Spoke length, tension balance, frame size. No sign-up, nothing stored on a server, and every tool tells you where its assumptions come from.
Open the toolbox- Below range
- In range
- Above range
- Not measured
Spoke tension around a rear wheel. The drive side runs tight, the non-drive side slack — that asymmetry is the whole problem wheelbuilding solves.
Drag a spoke to change its tension
The toolbox
Wheelbuilding
Lacing, length and tension
Fit and sizing
Getting the bike to match the rider
Drivetrain
Gearing, chain and compatibility
Tyres and pressure
Contact patch and rolling
Standards
Identifying what you actually have
Every tool here is finished and working. Upgrades is the part still being built — it will pull live listings from Hungarian bike shops.