Originally Posted by
dddd
Shimano 7s cog spacing is about the same as Campag 8s, but note that the 2-3 cog spacer (between 2nd and 3rd-smallest cogs) is 3.3mm instead of 3.1mm like the rest of the plastic spacers. The 3.3mm spacer has a darker color. It can be replaced with a 3.1mm spacer if there is any indication that this would help with the indexing.
Thanks, great idea. Just sacrificed a 7 speed cassette and salvage a 3.1 mm spacer . Good project for tomorrow, as it will be raining for 2 days. Might as well make this 13x34 casstte perfect. Why is that one spacer 3.3mm ?KB