Shimano UN54 Cartridge Bottom Brackets Relative Chainline

By Kevin | Published: December 15, 2009

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.

Bottom BracketOverall LengthDrive Side Length
Sugino/Tange 68-103103mm18mm
Shimano UN54 68-107108mm20mm
Shimano UN54 68-110111.5mm20mm
Shimano UN54 68-113114mm22.5mm
Shimano UN54 68-115115.5mm23.5mm
Shimano UN54 68-118118.5mm25mm
Shimano UN54 68-122123mm28mm
Shimano UN54 68-127128mm30mm

Cartridge Bottom Brackets from Harris Cyclery

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2 Comments

  1. Mike
    Posted December 15, 2009 at 6:24 pm | Permalink

    Thanks for taking the time to measure them!

    Reply
  2. superfreak
    Posted December 29, 2009 at 9:28 am | Permalink

    nice tech details in the spirit of sheldon!

    Reply

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