Originally Posted by
shelbyfv
Would anyone like to speculate as to why 11speed and up should be replaced at .5 (or whatever fractional corresponds) vs the older .75?
Good question. Who came up with these values and why. Industry standard is 1% and there is no logical reason it why its either 0.5% or 0.75% depending on 10s vs 11s. In shimano cassettes the actual cogs are identical in 10s vs 11s. Only spacing and # of cogs differ slightly. Not to mention its unclear if its 0.5% actual elongation or roller wear should be included. Park used to have a tool that included roller wear, now they have one that doesn't, but the recommended values stay the same even if different methods give very different results. Makes no sense what so ever.