Bike Forums - View Single Post - BB size/threading?

10-26-10 | 08:13 PM

#4

Retro Grouch

Senior Member

Joined: Feb 2004

Posts: 30,225

Likes: 649

From: St Peters, Missouri

Bikes: Catrike 559 I own some others but they don't get ridden very much.

A quick and dirty method:

Measure the width of the frame's bottom bracket shell (excluding the BB flanges). 68 mm = English. 70 mm = Italian.

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