Do I need a new cassette?

[Fordie00]

Just got a second hand road bike really cheap (£50) from one of my mates who upgraded. I used my chain checker and the chain was very very stretched / worn.
Got a replacement chain and fitted it no problem. Went out on the bike and it feels like the chain is jumping / skipping. If the chain was that badly stretched (daylight visable between cassette and chain) does it sound like its jumping the teeth on the cassette? I have indexed the gears again just incase but it's not that?

Cheers.

 

[Fordie00]

No idea how many miles.
Before replacement chain...

 

[Fordie00]

Did your mate warn you of any problems with the gears or chain? I'd be cheesed off if any of my mates sold me something without letting me know about any faults that might be expensive to fix.

But I suppose if it's a decent brand bike that's been looked after fairly well, then you might have a bargain.

No, he didn't. In fairness the ride seemed fine before I decided to replace the chain. It's only a Carrera Virtuoso but at £50, if I have to put £100 into it I still wont loose any money reselling.

 

[Fordie00]

I measured the old chain with the new one, measured twice and cut once lol definitely same number of links and like I said, the chain wasnt slipping on the old one. Which makes me think it's a cassette issue as they've both worn together.

The chain doesn't slip off any of the gears, front or back. It jumps a link or 2 under load.

 

[Fordie00]

Purchased a new cassette and that has fixed the skipping problem. Haven't touched the gears as they still index fine with the like for like cassette.

Obviously a very worn chain has also worn the cassett causing the new chain to jump teeth on the old worn cassette.

F0RDIE.