fwiw I used the sheldon method to cold set my nishki from 126 to 135. While a bit a scary initially taking a 2x4 to a frame....it was really pretty easy. think that it is only 4.5 mm per side (or roughly 3/16")
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)