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@ghettro
Slight update
Stripped the anodising and polished the cranks.
Managed to get a used Chorus BB. Odd thing is when installing the NDS cup you could feel bearings starting to bind before it bottoms out. The BB shell is 68mm exactly so not sure what is wrong, googling it turns out that this is not uncommon and I ended up just loctiting it in there before it binds. NDS cup was not exactly loose in any case so should just stay.
I scored a set of Centaur callipers on the advice of @may and it looks like they fit a lot better. Front is only out by a few mm so I think I can file the slots out slightly.
Rear is perfect without any modification
The only thing is that with tyre clearance looks like max is about 28-29mm at the rear as the chain stays are the pinch point. Seatstay bridge has loads of clearance. Fork you could probably fit 32mm or maybe 35mm. Quite odd!
Did a bit of a mockup with some spare wheels…
