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
- Gear ratiosWhat gearing do I have, and where does it overlap?In build
- Chain lengthHow many links does my chain need?In build
Tyres and pressure
Contact patch and rolling
- Tyre pressureWhat pressure should I run?In build
- Tyre size converterWhat does 700x28c mean in ETRTO?In build
Standards
Identifying what you actually have
- Bottom bracket finderWhich bottom bracket standard is in my frame?In build
- Torque specsHow tight should this bolt be?In build
Building these next. The wheelbuilding and fit tools above are finished and accurate today.