Originally Posted by
mtmann
First, are there any issues in converting from 27 inch wheels to 650b that are not covered in the 700-650b discussions?
You need an additional 4mm of reach going from 27" to 650B as compared to 700c conversions. That's usually lots of reach, more than Mafac Racer brakes will offer. I did a 630mm to 584mm conversion recently and ended up using old Weinmann calipers that had 81mm of reach. You can usually find brakes with that kind of reach made for BMX bikes (or a pair of Mafac Raids).
Originally Posted by
mtmann
Second, are 650b wheels spaced for a 126 rearend fairly easy to find?
Most new wheelsets will be for 130 or 135mm spacing, so you can either cold set your frame or swap the axle if it's a hub that'll allow that.
Neal