Author Topic: Bearing sizes -advice needed- (Read 723 times)

FuNMoNsTeR · « **on:** July 14, 2006, 05:51 PM »

I need to replace bearings in some of my wheelsets. Can anyone tell me the bearing diameters of the front and rear bearings please?

TwoBobRob · « **Reply #1 on:** July 14, 2006, 06:32 PM »

Loose balls or sealed units? If its sealed bearings you can just use the codes you'll find on the side of the bearing itself and buy them from a bearing manufacturer rather than a bike shop. British or Japanese bearings are better than the more popular Chinese I'm told

Loose balls? Ain't got a clue.... sorry bud

FuNMoNsTeR · « **Reply #2 on:** July 14, 2006, 07:33 PM »

Loose ball

thanks anyway m8

selfpreservation · « **Reply #3 on:** July 14, 2006, 08:09 PM »

Bearing ball
A steel ball that is part of a ball bearing assembly. Most front hubs use 10 3/16" balls on each side; Most rear hubs use 9 1/4" balls on each side. Most bottom brackets use 11 1/4" balls on each side.
Bearing balls are made in batches, and within a batch the size is very carefully controlled. From one batch to another, however, there can be a considerable variation in actual size of balls of the same nominal size. For this reason, balls from different batches should never be mixed in the same bearing.

Bearing balls come in several quality grades, designated by numbers. Grade 25 is the best that is available for bicycle applications. Grades 100, 200, even 300 are commonly used in bicycles.

from sheldon browns site i havent a baldy notion myself