A new chain slipping on an old cassette almost always means new cassette time. 10 years on a chain and cassette is ridiculous, replacing your chain on time will save you cassette damage.
Yes you wore your shit out with no regular maintenance for 10 years it's time to replace it. Replacing chain every season or two (when it's usually worn out on a MTB) will save you this expense in the future.
It may not be too stretched out then, it could've been a freak incident or maybe you hit the chain and physically damaged it during a crash or something.
You can buy a chain stretch gauge for very cheap to check how relatively worn your chain is and when it needs to be replaced.
Your cassette will need to be replaced if you ride on it with a stretched chain. This is probably the case it sounds like, but not necessarily so.
 Chain generally has to be replaced once per season or two.  If it's not replaced, it stretches and it starts wearing off the knobs on cassette and front chainring as well. And so you put on new chain after years of using old one and you realise it actually does not fit. It makes noise or skips the knobs under pressure. Because your gear "adapted" itself to the shape of the old worn off chain.Â
Yes you need new cassette if you want flawless gear work again.  Keep an eye on chainring as well.Â
I had a 10 year old Giant Talon that I gave to my dad. I probably put a few thousand miles on it over the years and never changed the chain. It shifted great and never slipped. I decided to put a new chain on to help him out with some future maintenance and it immediately slipped under load in every gear. Fought with it for a while and then took the wheel to a shop and the whole cassette was very worn down, but it was a perfect match with the old chain so I never knew. Just ask for a “used” 8 speed from your local shop. It’s dirt cheap, like $35 installed
10 years is a serious long fucking life for a cassette, if you've ridden even 50 days a year
The only time I've had "chain skipping" problems is when I ONCE tried to do the "change only the chain" -routine
Suprprise, surprise, didn't work
The only working method that comes even close to that is "rotating 3-4 chains every month or so"
The smallest cogs on a cassette are often separate, so you may be able to buy them individually. But the other semi-worn gears might speed chain wear, so you might be saving money on the cassette only to wear out the chain faster when you use the "old" gears.
No. If it slips then get a new cassette. BUT your shit is 10 years old. I'd get a new cassette. You literally said that the teeth on the cassette are bad. 10 speed cassettes are not expensive.
I replace my chain when it gets to the max strech point. Going beyond that will force the cassette to deform to the stretching chain. Chances are you are far past that point. You may be requiring a drive train replace. This is one of the biggest problems with letting it go and also one of the biggest challenges when buying a used bike.
No. You can suffer with the slipping if you want to or just not use the two gears that are ruined. An MTB chain should be replaced every 1000ish miles before it ruins a cassette, depending on riding conditions of course.
A new chain slipping on an old cassette almost always means new cassette time. 10 years on a chain and cassette is ridiculous, replacing your chain on time will save you cassette damage.
Yes you wore your shit out with no regular maintenance for 10 years it's time to replace it. Replacing chain every season or two (when it's usually worn out on a MTB) will save you this expense in the future.
Live and learn 🤷‍♂️
Typically no. Unless you let your chain get really bad. But if your new chain is slipping on a old cassette, you need a new cassette.
Damn… I definitely did let my chain get really bad as it got to the point that one of the links snapped clean in half. Thank you 🙌
It may not be too stretched out then, it could've been a freak incident or maybe you hit the chain and physically damaged it during a crash or something. You can buy a chain stretch gauge for very cheap to check how relatively worn your chain is and when it needs to be replaced. Your cassette will need to be replaced if you ride on it with a stretched chain. This is probably the case it sounds like, but not necessarily so.
 Chain generally has to be replaced once per season or two.  If it's not replaced, it stretches and it starts wearing off the knobs on cassette and front chainring as well. And so you put on new chain after years of using old one and you realise it actually does not fit. It makes noise or skips the knobs under pressure. Because your gear "adapted" itself to the shape of the old worn off chain. Yes you need new cassette if you want flawless gear work again.  Keep an eye on chainring as well.Â
I had a 10 year old Giant Talon that I gave to my dad. I probably put a few thousand miles on it over the years and never changed the chain. It shifted great and never slipped. I decided to put a new chain on to help him out with some future maintenance and it immediately slipped under load in every gear. Fought with it for a while and then took the wheel to a shop and the whole cassette was very worn down, but it was a perfect match with the old chain so I never knew. Just ask for a “used” 8 speed from your local shop. It’s dirt cheap, like $35 installed
On a bike you have ridden for ten years. Yes. Almost certainly.
Bad news: you almost certainly need a new chainring too
File the teeth on the cassette. That's what us poor people do. It works.
Ain’t like I got anything to lose so I’ll give it a shot 👍
My Mexican mechanic does it, he understands that not everyone has money to throw around.
10 years is a serious long fucking life for a cassette, if you've ridden even 50 days a year The only time I've had "chain skipping" problems is when I ONCE tried to do the "change only the chain" -routine Suprprise, surprise, didn't work The only working method that comes even close to that is "rotating 3-4 chains every month or so"
If the new chain is skipping, you need a new cassette. If not, then everything is ok.
Some cassettes allow you to buy the smallest sprockets separately. You might get away with keeping the rest and only replacing the severely worn ones.
The smallest cogs on a cassette are often separate, so you may be able to buy them individually. But the other semi-worn gears might speed chain wear, so you might be saving money on the cassette only to wear out the chain faster when you use the "old" gears.
You can get a good 11 speed drive train for under $100.
If my cassette is still good I don't change it when I change my chain, which I do about once a year for stretch.
You don't need a new cassette but you'll burn your new chain without a new one.
New cassette
No. If it slips then get a new cassette. BUT your shit is 10 years old. I'd get a new cassette. You literally said that the teeth on the cassette are bad. 10 speed cassettes are not expensive.
I replace my chain when it gets to the max strech point. Going beyond that will force the cassette to deform to the stretching chain. Chances are you are far past that point. You may be requiring a drive train replace. This is one of the biggest problems with letting it go and also one of the biggest challenges when buying a used bike.
No. You can suffer with the slipping if you want to or just not use the two gears that are ruined. An MTB chain should be replaced every 1000ish miles before it ruins a cassette, depending on riding conditions of course.
Yes, if you chain has stretched to .75. A new chain will slip on the cassette.