Cable-travel adapters are used to make direct-pull cantilever brakes compatible with brake levers for other types of brakes, and to achieve compatibility with mismatched shifter-derailer-cassette combinations.

The tables in this cribsheet identify compatibility of shifters and internal-gear hubs currently or recently in production as of 2014, and one classic antique.

Bottom-bracket dimensions listed in order of bottom-bracket shell internal bearing seat diameter so as to highlight compatibilities.

• internal or external bearing cups
• Phil Wood and other mounting rings for cartridge bearings
• threaded cartridge-bearing assemblies

Mixing and matching cups and spindles can have an unexpected effect on chainline, or may not even be possible.

Many references describe these measurements as "center to center," but there is nothing to measure from at the center of a hole! Very fortunately, all of the bolt holes are the same size, and measuring from right side to right side or left side to left side neatly avoids this problem!

This is the printout version of Sheldon Brown's Cyclecomputer Calibration Chart with links to calibration procedure instructions pages for particular models.

With stem clamp size, grip area size, and application.

Listed in order of frame cup outside diameter, crown race inside diameter, steerer O.D., and threads per inch -- the dimensions which affect headset compatibility with frame and fork.

and where these measurements are likely to occur.

Frame/Fork Spacing and
Cassette/Freewheel Spacing by Brand and model with Center-to-center Spacing, Sprocket Thickness, Spacer Thickness, and Total Width.

The more common sizes are shown with a white background, the less common varieties are shown with a gray brackground. Commonly confused sizes are noted.