tweak the frame, tie a piece of string to the left rear dropout loop it round the head tube and then in the same place on the right then very slowly take the 5mm out each side. and check with a rule that the distance between the string and the seat tube is the same.
tweak the frame, tie a piece of string to the left rear dropout loop it round the head tube and then in the same place on the right then very slowly take the 5mm out each side. and check with a rule that the distance between the string and the seat tube is the same.