Oh and another thing, a 30 second look at Wiggle CR and Evans at fishing tackle groupsets in that price range is all 11 speed.So, quick one, I've had Bi for about 4 years now, according to Strava I've done 4000 miles on her; rain wind and snow. I've only changed tyres, cables, chain and front mech. I bought it off a friend who may have also done a few 1000 miles on her too.
Anyway, BB is loose, took her in to LBS and we get into chat about whole groupset replacement as given we might be upward of 5000 miles, might be worth doing rather than doing one bit at a time. Current groupset is fishing tackle 105. They even suggested getting a deal of Chain Reaction or something and they'd fit it as they can't compete on groupset prices and would have to get it in special.
So, fishing tackle groupset Ultegra is about £430 plus say £150 to fit. A new 105 set would be £240. Would you always upgrade? Is it best to stick with the fishing tackle if that is already what the bike is set up with? Am I better doing just the BB, chainset and drive chain, or is a wholesale groupset change the way to go? I can always use the stripped off components on another bike. Must admit rear mech is looking a bit beaten up and as I've said before on this forum is only doing 9 gears instead of 10. LBS reckoned the springs inside can go, but could also could be the hanger to be fair which I don't think is dead vertical.
Decisions decisions.
If that is the case and what your looking at you need to check if the new cassette is compatible with your current wheel hub.
Also another bike with the old groupset might not be compatible with the new gs, as and when more hand-me-downs become available in the future.