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Its an age old theory that you shouldn't mix new and old drivetrain parts but how much should I worry? I'm running full 2012 SLX 10sp with about 1,500 miles wear, my chain snapped so I'm replacing with a new one - should I worry?
That might sound high mileage but last year on my old bike I did about 3,000 on the original chain, chainset, cassette etc no probs......
I'd say suck it and see, but I just did the same with new chain, old cassette and it basically ruined what was otherwise a top ride.
It depends on how worn/stretched your chain was. I recently replaced my rear mech, cassette and chain because I bent the hanger, not through wear - it all still worked fine even though it was a 18months since I'd changed them. On testing it, the middle ring at the front skipped so badly that it was unrideable so I had to replace that too. I wouldn't have thought of changing any of the front rings but the granny is now a bit skippy too. I have been told by various LBS that riding 50k per week, you should change your chain every 6 months.
All you can do is try it - if it skips, you need a new cassette. If you get chain suck, you need new rings.
I certainly wouldn't worry! But there's a very good chance you'll be needing a new cassette!
I change chains at indicated 75% wear, currently on 4th or 5th with same cassette and rings and everything works fine - try it
Unless you use XTR/X.0/XX cassettes that's a false economy IMO. Say chains are £30, you get to 0.75 after 3 months, that's £120 on chains per year and £50 for an XT cassette which lasts (say) 2 years. Or you could just replace both once a year, works out much cheaper.
Ok cool I'll suck it and see. My hunch is its just crappy shimano chains not lasting well. Also with a triple chainset and 10sp cassette there are plenty of cogs to spread the wear across so can't imagine they are in too bad a state.
New chain is SRAM so I expect some serious mileage out of that rather than Shimano crap!!