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Technical & Reference Section => Tech and Restoration => Topic started by: gib66 on March 31, 2013, 09:41 AM

Title: bottom bracket bearing code
Post by: gib66 on March 31, 2013, 09:41 AM

does anyone have a set of 20mm bottom brackets.i need the bearing code for it so i can order some new nearings .they need to be for a usa bb set

Title: Re: bottom bracket bearing code
Post by: TwoBobRob on April 08, 2013, 10:36 PM

Have you not got a mid or U.S. bb knocking about? Quick measure up and you're there.

A normal mid/U.S. bearing is an R12 2RS. This is imperial, the internal diameter is actually 3/4" or 19.05mm. You could bowl into your bearing house and ask for the metric equivalent of an R12 with a 20mm ID I suppose.

They might look at you a bit funny....

Title: Re: bottom bracket bearing code
Post by: Gary72 on April 08, 2013, 11:14 PM

I think it's 6004.
The 2RS bit refers to the numer of rubber seals

Title: Re: bottom bracket bearing code
Post by: Gary72 on April 08, 2013, 11:38 PM

http://www.customriders.com/prodshow.asp?prodid=10147&cat=10&parent=1001&sid=3