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-   -   68mm or 73mm Bottom Bracket? (https://www.bikeforums.net/bicycle-mechanics/188388-68mm-73mm-bottom-bracket.html)

Comatose51 04-15-06 11:14 PM

68mm or 73mm Bottom Bracket?
 
I'm reading this article on how to install external bottom bracket bearings. How can I tell if I have a 68mm or 73mm BB? Also, my FSA Gossamer didn't seen to have come with any spacers. Where can I get those? Would any ring that fits work? What is the diameter of the crankset axle?

Thanks.

fmw 04-16-06 06:01 AM

The best way is to measure it. Failing that, understand that most road bikes are 68mm and most mountain bikes are 73mm.

phillybill 04-16-06 06:03 AM

What type of frame is it? If it's Italian it is mornally 73mm.....otherwise 68mm

msheron 04-16-06 06:56 AM


Originally Posted by fmw
The best way is to measure it. Failing that, understand that most road bikes are 68mm and most mountain bikes are 73mm.

Correct.............but to make you feel better.............measure it.

HillRider 04-16-06 07:02 AM


Originally Posted by phillybill
What type of frame is it? If it's Italian it is mornally 73mm.....otherwise 68mm

If it's an Italian frame and is "Italian" threaded, the bb width is 70 mm. (many current Italian frames are English threaded.)

English threaded road bikes are 68 mm and English threaded MTB can be 68 or 73 mm.

Comatose51 04-16-06 02:03 PM

It's a Cannondale R700 and it's English thread for sure so it's 68mm.

Thanks guys.


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