But I was told prior to purchase by both Matt and Caren the frame would take a 42mm 650b tyre, so you would expect 4mm of clearance on either side of the chain stays. At one point I had Caren denying she had ever said this, but I had the email to back it up.
When the bike first arrived a wheel with a 38mm tyre couldn't even turn because it caught the chain stay . It was returned and adjusted. but only to give about 45mm of spacing on the chain stays, so still not enough, also it was not evenly spaced on both sides.
It was returned again and came back with adequate clearance but only 129.9mm spacing at the dropouts. So had to be returned again.
And that is before I detail the problems with late delivery, misplacing of my parts (when the bike had been returned to Isen), rudeness etc etc.