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LeBlaireau-
Yeah, I raced it in TABR, TPR, TCR and Transiberica last year and a Hyper SR so I put it to pretty heavy use basically immediately. For road and baby gravel stuff it's been great. I had trouble getting the rear caliper flat - it's meant to be reamed/chased/faced whatever from factory but maybe mine had some excess paint on it. Anyway I got @scherrit to clean it up but it's only been on the turbo this year so I've not needed brakes anyway.
hippy
42mm looks like it would fit but it would depend on the style of the tyre and what shape it takes when inflated. The chainstay isn't squeezed in the right spot really for 650B