5/16 Inch Weldtite Ball Race with Grease - Pack of 2

£3.49 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Suitable for use with BMX bottom bracket cages.

Pack includes:
- 2 x Ball races
- 1 x 5gms Tube of white lithium grease

Internal diameter 31mm.
External diameter 45mm.
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Diameter Of Ball Race
07 Dec 2016

I'm looking at this product:


I assume that the 5/16 inch measurement is the diameter of the ball, which then would be about 8 millimeters. Correct?

I live in a country using the metric system, so I might be misunderstanding.

I'm interested in knowing the outer and inner diameter of the ball race. Also the size of the balls. If possible, preferably in millimeters.

Thank you.

Best regards

These bearings are 5/16" so this means they are 7.94mm in diameter. The outer diameter of the cage is 45mm and the inner diameter is 31mm.