Originally Posted by
jerrysimon
On my two speed Brompton I changed the chain after 1500 miles and it skipped on the highest geared cog. Changing the 12T cog for a new one fixed the problem.
I have a M6R (2 speed derailleur, 3-speed AWR hub) - I have a 16/13 sprocket setup. On closer inspection I noticed the teeth on the 13 cog are looking sharper than they should.
Also, I'm cycling on this cog 80% of the time. Combine that with a stretched chain, and I reckon I've got to replace these sprockets. But as you say, they're cheap enough.