Bike Forums - View Single Post - (Another) Question about spindle lengths and BB

09-30-12 | 11:35 PM

#4

DannoXYZ

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From: Mesa, AZ

Bikes: Moots RCS, tandem, beach-cruiser, MTB, Specialized-Allez road-bike, custom track-bike

Quote:

Originally Posted by HoraceLai

Hi,

I am looking into getting a new BB and I'm getting a bit confused with the measurements. From what I understand the BB size is the width of the BB as well as the length of the shaft that sits inside it. I measured the spindle length of my current BB and it is 135mm! I did the measurement again and got the same answer, but this seems to be 10-20 mm too long.

You want to measure from end-to-end of the square-taper tips. Do not included the threaded section if your BB-spindle uses nuts.

Measuring with bolt-type hollow BB-spindles:

http://thebikestand.com/campy-spindles.jpg

Simple way with both is to install the nut/bolts and measure the inner distance:

http://thebikestand.com/vint-C-spind...0-zw-bolts.jpg

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