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@mustard
I've hit an issue with my Twenty project. I want to use a road triple chainset left over from my short lived tandem.
The chainset is about 52mm to the middle ring with a 110mm bb and the hub is 42mm. I can get a threadless bb from SJS with a 103mm axle which will hopefully be close enough but it looks like the back of the crank will foul the bb. Would it be a really stupid idea to grind back a few mm off the back of the crank? There is plenty of material there.
I've tried it out with a 103mm bb and some plastic cups which have taken to what remains of the threads but I wouldn't expect it to last long under load.