Shimano UN54 Cartridge Bottom Brackets Relative Chainline

Here are some measurements I took from some of the square taper cartridge bottom brackets we carry. The drive side length is measured from the edge of the bottom bracket shell to the very end of the spindle. These measurements should be good enough relative to each other for chainline adjustment, but I wouldn’t use this chart to compare with bottom brackets from other manufacturers, which may have different taper lengths.

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Cartridge Bottom Brackets from Harris Cyclery

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6 Responses to Shimano UN54 Cartridge Bottom Brackets Relative Chainline

  1. Mike says:

    Thanks for taking the time to measure them!

  2. superfreak says:

    nice tech details in the spirit of sheldon!

  3. Charlie says:

    This page is broken, with the bb measurement info gone. Can someone fix this?

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