A basic frame check can be easily carried out by an individual using a check gauge. This is a very easy check to undertake and requires no specialist knowledge.
The gauge consists of two sides a “GO” and a “NOGO”. The frame should permit the GO side go go in, the NOGO side should be too large to go in.
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- This gauge is no substitute for accurate measuring with a calibrated micrometer. It is a quick check only.
- There is a reasonable manufacturing tolerance that has been applied of 0.02mm (or just under 0.001″. )
- The material has been left for the choice of the machinist. Brass, Steel, Aluminium are all acceptable
For BBright and BBCorrect (CERVELO and FACTOR)
Cervelo and Factor bikes use BBright or BBCorrect bottom brackets. At some point in the past they modified the tolerance range to make it wider. The gauge is for the original tolerance (pre-widening). Please be aware that their new tolerance range is so wide that no bearing manufacturer (SKF, NTN, NSK,FAG) will warranty their bearings in Cervelo and Factor frames, they have categorically stated the range is too wide to function correctly.