Shifting on my mountain bike failed. Thinking it was the inner cable about to break, I replaced that, but noticed it was actually the outer gear cable which had worn through near the rear mech. So I replaced that. I knew the chain was in need of replacement, so put a new one on and cleaned up the cassette and chainrings. The new chain wouldn't shift properly and skipped over the smaller rear sprockets. So I need a new cassette, rear mech and likely chainset as well.
I think, because I mainly ride the bike fast on-road, I spend a lot of time on the small sprockets and wear them out. I guess this is what you get when you use the wrong tool for the job! So I figure I might be better off either getting a trekking chainset (28/38/48) to replace the mountain chainset (22/32/44), and/or a road cassette (11-23 or 11-25) so I get a better spread of wear over the cassette. But of course I'll then have a bike that's less use off-road, although in practice I almost never use the lowest ratios.
Musings mainly about cycling, transport and the environment. Particularly in the London Borough of Merton.
Sounds like you aren't replacing your chain often enough. It doesn't matter which gears you are wearing out, if your chain is worn, something fails.
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