I don't think it should be different at different angles, so my guess is that it probably should have been 26.6 and its been over tightened with a 26.4. I had the same problem with my old Mercian (Retro de Corsa carefully stretched it with a screw driver back to the original shape).
I don't think it should be different at different angles, so my guess is that it probably should have been 26.6 and its been over tightened with a 26.4. I had the same problem with my old Mercian (Retro de Corsa carefully stretched it with a screw driver back to the original shape).
I'm sure it'll be fine with a 26.4 though.