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@Starelite
Today I installed a new miche cog (15t) on the stupid miche adaptor, tightened the lockring etc. However, on the first skid the cog slipped a little. The cog did not "slip back" when I pedalled forward. Next skid no problems with slipping. When I got home from my ride I rottafixed my cog, but the thing seems to be tight...any ideas what happend?
I must note that I only switched the cog, not the adaptor! Did not touch a chainwhip :) had no 'slip' with my old 18t cog...