Chain suck: Worn Ring?

philkeeble

My Hewitt Cheviot SE touring bike has done around 9,000 miles. Chains have been renewed religiously at 0.75% wear. Chainset and cassette are original. Lately, when changing up from the little ring, I have experienced chain suck on the middle ring rather too frequently.
Is this a sign that it’s time to replace my middle ring?

Thanks
Phil

lemonenema

sounds like it, take it off give it a wipe over (wd-40, gt85 etc on a cloth work wonders) and see if the teeth are hook shaped, but it does seem likely

david7m

I'm impressed with 9k on one cassette!
I have this feeling that starting to mix new bits with old is going to create more problems - just based on my experiences:)

cycleclinic

0.75% wear is too much for a chain. If I leave a chain that long I normally have trashed the cassette. You would get long chainring life and even longer cassette life, changing the chain at 0.5% wear. I should practice what I preach I just pulled of a chain of the audax bike that had 1% wear and a cassette so trashed none of it could be reused.

chain suck is a sure sign of trashed rings.

awavey

david7m wrote:

I'm impressed with 9k on one cassette!
I have this feeling that starting to mix new bits with old is going to create more problems - just based on my experiences:)

well I think thats just bikes in general, you fix one bit and pardon the pun the next weakest link in the chain, literally, then becomes the next problem issue, its whether continuing to replace bits in that fashion is then cost effective.

certainly my bike is probably not worth more than a replacement groupset and rear hub (as thats on the way out too) would cost in at now.

Alejandrosdog

thecycleclinic wrote:

0.75% wear is too much for a chain. If I leave a chain that long I normally have trashed the cassette. You would get long chainring life and even longer cassette life, changing the chain at 0.5% wear. I should practice what I preach I just pulled of a chain of the audax bike that had 1% wear and a cassette so trashed none of it could be reused.

chain suck is a sure sign of trashed rings.

.75 is the accepted optimal point to change 10 speed and lower chains.

.5 for 11 speed.

philkeeble

Thanks for all replies. My chain checkers (both brands) only have 0.75 and 0.1% wear indicators. Not seen one that has 0.5%. Bike in question is a 9-speed. New chain rings now on order. I've ordered two because a) my wife has same bike and has only a few less miles on it than me and b) because 9-speed chain rings are rapidly becoming scarce!

lemonenema

Well here's news for you... You don't have to use 9 spd chainrings! My MTB has a 9spd cassette and 10/11spd narrow-wide single, and my road bike has an 11spd double crankset with a 9 spd cassette, with a 10spd chain! I had to get an 11spd front derailleur but still on standard shifters

Happy fettling!

Alejandrosdog

philkeeble wrote:

Thanks for all replies. My chain checkers (both brands) only have 0.75 and 0.1% wear indicators. Not seen one that has 0.5%. Bike in question is a 9-speed. New chain rings now on order. I've ordered two because a) my wife has same bike and has only a few less miles on it than me and b) because 9-speed chain rings are rapidly becoming scarce!

Nice, ive got some 9 speed chainrings my wife is still on her dura ace triple from over a decade ago and pre children. It’s good stuff.

dabber

philkeeble wrote:

Thanks for all replies. My chain checkers (both brands) only have 0.75 and 0.1% wear indicators. Not seen one that has 0.5%. Bike in question is a 9-speed. New chain rings now on order. I've ordered two because a) my wife has same bike and has only a few less miles on it than me and b) because 9-speed chain rings are rapidly becoming scarce!

The Park Tool Chain Checker CC-3.2 has 0.75 and 0.5
https://www.parktool.com/product/chain-wear-indicator-cc-3-2