Wondered whether anyone else has experienced a similar problem to mine. I have a Surly LHT frame and think it's the dog's pyjamas. I fitted the cheap Shimano cantilever brakes I had at the time, and, although quite snug fitting them onto the bosses, i didn't think this was a problem - it certainly didn't seem to affect their performance. Getting them off however, involved a hammer and a screwdriver and a lot of swearing!. They seemed to slide off for about half a centimetre and then get jammed. they were well lubricated (oo-er - cheap joke) so this wasn't the problem. When I did finally get them off, i slid them onto the bosses on another frame i have kicking about and they went on and off very easily. Does the Surly have slightly larger bosses does anyone know? Maybe the Shimano brakes are snug?!? I am hoping that the new Tektro CR720's I have bought will fit OK and that I haven't got a funny Surly frame so any advice etc you can give would be gratefully received, as always.