DELETED_5350

If it's been as badly neglected as you say, just changing the chain won't be enough. You'll want new chainrings, cassette, chain and jockey wheels or even a new derailleur too.
 
The cassette is more likely to be worn than the chainrings. The jockey wheels should be pretty cheap to replace, but I doubt they're causing your problems with shifting. The shifting issues could be down to the indexing of the gears.

It might be worth just taking it to your LBS and asking them to look at it and service it. When I dug my mountain bike out of the attic last year after 5 years without use, the LBS serviced it and put two new Giant tyres on it for £60, which isn't bad.
 
Chain: Sram PC971 will be good enough.
gear cable and outer don't cost much.
Cassette: Shimano Deore will probably be better than what came with the bike
Chainrings can be expensive. See how worn they are. If you need a bottom bracket too then you might be as well getting a whole new crankset.
Jockey wheels should have a bit of play in them. Only replace them if they are worn RIGHT down.
To do the work you will need some basic tools. Chainwhip, cassette removal tool, chain tool. Bottom bracket tool, cable cutters and allen keys.
Take the bike into a bike shop for an opinion and take it from there. I replaced all the above parts [more or less] on the other halfs bike for c£120, and thats with me doing all the work.
 
weescott said:
Chain: Sram PC971 will be good enough.
gear cable and outer don't cost much.
Cassette: Shimano Deore will probably be better than what came with the bike
Chainrings can be expensive. See how worn they are. If you need a bottom bracket too then you might be as well getting a whole new crankset.
Jockey wheels should have a bit of play in them. Only replace them if they are worn RIGHT down.
To do the work you will need some basic tools. Chainwhip, cassette removal tool, chain tool. Bottom bracket tool, cable cutters and allen keys.
Take the bike into a bike shop for an opinion and take it from there. I replaced all the above parts [more or less] on the other halfs bike for c£120, and thats with me doing all the work.
Click to expand...

This really ^

That's what I've got on mine pc970 + Deore cassette. Change that and then test ride on under load to see if it slips on the front chainrings.

Had a bike the other day that looked like it would slip in the middle ring but didn't.

As said if the BB is gone and/or the chainrings you could upgrade to a Deore chainset for about £70 rrp inc. Bb.

Jockey wheels should have play on the top one and the bottom should have no/less side to side play. Replace if they are uber jaggy/can see fresh air through it with the chain running on it.
 
Looking at the pics posted nothing seems excessively worn or in need of replacing, without a hint of sarcasm it all needs a damn good clean though. Are the gears shifting cleanly but the chain slipping under pressure i.e.. when going up hill or are the gears "skipping" or making that clicking whir between transitions ?
 
I'd be tempted to completely redo the drivetrain.

I've recently done this myself.

New chainring, chain, cassette and mech jockey wheels.

While it sounds expensive, I think the whole lot came to less than £50, and my shifting is better and quieter. The hardest part was getting the lockring off my old cassette, that thing was on tight!

EDIT: Jockey wheels are supposed to have side to side play on many mechs, in fact it's supposed to help shifting according to the Shimano patent.
 
Depends how much you have used it. If its spent most of the time not being used a new chain and a good clean up with some lube will be good enough. I'd be tempted to replace the cables over the cassette and crank, and see how it goes.
 
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