Chain slipping on cassette under load

[NorthernSky]

No problem.

this would be good, as i don't mind just getting a tiagra cassette (only come in 12-28 that i can see)
don't need to spend big on a 105 12-27 if possible

 

[Globalti]

@Dec66 did you get the issue sorted?

my chain is slipping EVERY time load is applied from a stop (at a junction or on steep hills)
bought new chain and still happening so next step is a replacement cassette me thinks

Q. can i replace a 12-27t cassette with a 12-28t? i've just fitted the chain for the current 12-27t so may have snookered myself?

That's because your chainring is worn out. Fitting a new chain to a worn ring won't help and may even make the slippage worse. Take the bike to a shop and get the mechanic to confirm which bits need replacing.

 

[keithmac]

We do them as a set 9 times out of 10 on the motorcycles, people let the chains get that knackered that the sprockets have no chance!.

Easier to see a hooked or worn sprocket due to the design but if you look closely enough at bike sprockets/ chainrings you can normally see if they've had it (like the picture a few pages back!.).

 

[Ajax Bay]

That's because your chainring is worn out.

@Dec66 had the worn chainring in December (hopefully now changed). @NorthernSky just has normal symptom of worn cassette and chain, replaces cassette to no avail; so needs to replace cassette as well. No indication (yet) that they have a chainring wear issue.

 

[Dec66]

Nope, chainring still on.

Bike sat in turbo trainer

 

[Nigelnightmare]

More money than sense!
Running the new chain on the old rings will wear both chain and the new cassette out very quickly.

After asking for help/advice on here and completely ignoring it.

I see a large BILL in the near future.