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BB compatability(2 posts)

BB compatabilitybiker83
Dec 30, 2003 4:52 PM
Are Ultegra BB compatable with tiagra or 105 cranks?
Assuming you are talking current...TFerguson
Dec 30, 2003 4:57 PM
The Ultegra BB is splined (Octalink). The 105 crank is splined and will fit. The Tiagra is a square tapered and will not fit.

If everything is older and square tapered, then they all will fit on the BB, but I'm not sure about spindle lengths.

TF