Current Projects chat and miscellany

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gbj_tester in reply to @pdlouche

Even if my shit old measure was out by .5mm, still doesn't explain why the bb axle sits at the wrong depth

If your axle really was 13mm minimum across flats, the crank would be pushed out about 9mm. The error on the axle width is multiplied by 28.6 (i.e. 1/tan2°) as an axial displacement of the crank.

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JWestland in reply to @gbj_tester

I'm getting 12.6 on my shit old caliper 2 mm of the end.

But they still sit out. Perhaps the part nearer the middle of the bb is off?

Note I have an 111mm one like @pdlouche. You were measuring an 103 which works OK.

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gbj_tester in reply to @JWestland

Perhaps the part nearer the middle of the bb is off?

You'd need to measure the taper angle, or at least colour in the flats with a blue Sharpie® and assemble to see whether you're getting uniform contact.

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