Originally Posted by
mercator
Stuff that has worn out for me on lower end groups that doesn't wear as fast on higher end:
- jockey wheels
- cable fixing bolts (actually the threads in the aluminum body of the derailleur - the bolt was fine)
- bottom bracket bearings
- hub races
- pedal bearings
I figure cassettes, chains, chainrings and cables are consumables anyway, so comparing wear rates on them is not really germane to the discussion.
My first nice road bike had 105. I performed exactly zero maintenance on the bike and I never replaced anything and the bike worked perfectly aside from a noisy chain. I did eventually oil it eventually after a few years. Zero maintenance for 7 years, no problems except a noisy chain, until, sadly, the bike was stolen.