I own a custom built 2006 Merlin CR 3/2.5, I have been using 25mm tyres and want to now use 28mm, 28mm tyres vary so much that some are wider than others. I have fitted some Panaracer 28mm to the frame and there is about 1mm clearance and suspect on climbs or powering out of the saddle the frame will flex and cause the tyre to rub on the chain stays.
I wanted to know if anyone knows someone in the UK you that can work on the existing chain stays and make them a bit wider by manipulating them to give me 5-10mm on each side to accommodate 28mm tyres. Maybe incresing the dimple in the stays ?
If that's a bad idea, anyone got good recommendations for low profile 28mm tyres as the Panaracer Evos i have come up more like 30mm!