Do I need new chainrings (pics)

seanorawe

So im waiting on my new chain arriving because it was slipping/skipping on the chainrings. Does it look like my chanrings need replaced? they only have 1200 miles on them but im hoping I get another 800 - 1k miles on them. I have attached my cassette too but it looks fine to me.

ps I know they all need a good scrub.

drlodge

A chain should last around 3,000 miles. A cassette should last 3 chains. Chainrings should last longer than this.

From what I can see they look fine. Why do you expect your Chainrings to last only 2,000 miles?

trailflow

No. 1200 miles is nothing for chainrings. They will last 5x+ that. The cassette and chain will wear out before the chainrings do. If they were all new.

The skipping may have been from the worn chain or cassette, bent chainring, poorly adjusted derailleur, unseated wheel, loose chainring bolts, loose crank, loose cassette/hanger/RD/jockey wheels/cable or damaged chain. So worth checking those.

If the cassette is really worn. The new chain will skip on it.

But your cassette also looks fine to me.

arthur_scrimshaw

Don't want to ruin your day but it's unlikely to be jumping on the chainrings, they look ok, worn but not toasted. Far more likely to be jumping on the cassette and you most likely find when you put a new chain on this will get worse because the cassette is also worn out.

fenix

Nope - they're fine.

seanorawe

drlodge wrote:

A chain should last around 3,000 miles. A cassette should last 3 chains. Chainrings should last longer than this.

From what I can see they look fine. Why do you expect your Chainrings to last only 2,000 miles?

Just because all of the internet forums are saying if the chain is skipping I have probably done damage to the chainrings or cassette and its wise to change them at this stage?

THis is why I always post on this site, you get proper answers (sometimes)

drlodge

Don't believe what you read on Internet forums!! Its more likely the cassette is worn, but it looks OK to me. Try the new chain and if its still skipping, it must be something else. Is the rear derailleur properly indexed, as if its out a tad e.g. due to cable stretch, this can cause the chain to skip especially in low gears when going up hill.

dgunthor

look good to me.

in over 20 years i've rarely replaced a chainring due to wear and then it's either an inner road chainring or middle MTB
(no, I don't ride 20,000 miles a year admittedly)

seanorawe

drlodge wrote:

Don't believe what you read on Internet forums!!.

Ok, ill ignore everything you just said

dee4life2005

Have you also checked that you don't have a stiff link in your chain ... I had a stiff link in mind recently after impact from a stone and it caused horrendous skipping ... and that was about 20 miles after fitting a new chain / cassette and it was running like a dream until that point.

itboffin

as others have already said they're fine the chainrings has tiny bit of wear and the cassette is peachy

what's the chain like? that's always going to be the first part to wearout.

when you say 1200 miles is that for this drivetrain or the whole bikes? if its the bike you most likely just have some cable stretch and need to reindex the rear mech, there's plenty of youtube videos and a whole section here on BR.