When do you replace chainrings(SRAM Eagle)? What interval?

[bergsnj]

I just swapped out my cassette and chain with new ones. The old cassette had about 2500 miles on it and the chain had about 1500 miles on it. I did not change the chainring which has 2500 miles on it. Its the 30T X01 chainring if that makes a difference. I did clean it so that no old debris gets in the new chain. But now I'm wondering if I should throw on a new chainring too.

 

[jackx]

I just swapped out my cassette and chain with new ones. The old cassette had about 2500 miles on it and the chain had about 1500 miles on it. I did not change the chainring which has 2500 miles on it. Its the 30T X01 chainring if that makes a difference. I did clean it so that no old debris gets in the new chain. But now I'm wondering if I should throw on a new chainring too.

sounds like it may be a good idea to replace the chainring so that everything is new (sept the derailleur pulleys).

But you'll probably know if the old chainring starts slipping with the new chain.

1,500 seems like a lot of miles for a MTB chain, but my experience was with a 2X10, so maybe I did a lot more cross-chaining maybe.

 

[shrpshtr325]

i have 2500ish miles on my eagle chainring and havent had any problems, change it when it needs it (I also havent worn out the cassette in that time either, but im pretty OCD about chainwear)

 

[bergsnj]

sounds like it may be a good idea to replace the chainring so that everything is new (sept the derailleur pulleys).

But you'll probably know if the old chainring starts slipping with the new chain.

1,500 seems like a lot of miles for a MTB chain, but my experience was with a 2X10, so maybe I did a lot more cross-chaining maybe.

I try to keep the chain really clean and lubed all the time. It was really stretched, pretty amazing when i lined it up next to the new chain.

 

[Santa]

I never pay attention till it’s too late and I replace everything. But also never have any issues even when chain is too worn as long as I don’t switch cassette or rings. Don’t pay attention and just replace everything in the winter is my philosophy!!!

 

[Steve Vai]

I'm currently testing this for Sram ATM. So far in the Test Pool we've come up with 300 hours as a recommendation, but I'm running group until failure.

 

[mfennell]

you need one of these: https://smile.amazon.com/Bikehand-B...=1593171847&sprefix=chain+meas,aps,159&sr=8-4

Despite using that tool and replacing the chain as required, I only got about 2500 miles out of an XX1 ring. Pretty underwhelming. Cassette is still fine.

I've never replaced a shimano chainring. I have 14k+ Strava miles on the bike I now use for Zwift and I owned it for 8 years before that so probably 25k miles on the original Ultegra chainring and 9sp cassette.

 

[shrpshtr325]

you need one of these: https://smile.amazon.com/Bikehand-Bicycle-Chain-Indicator-checker/dp/B00811WQW0/ref=sr_1_4?crid=1ZMA1EVUNRLVT&dchild=1&keywords=chain+measuring+tool&qid=1593171847&sprefix=chain+meas,aps,159&sr=8-4

Despite using that tool and replacing the chain as required, I only got about 2500 miles out of an XX1 ring. Pretty underwhelming. Cassette is still fine.

I've never replaced a shimano chainring. I have 14k+ Strava miles on the bike I now use for Zwift and I owned it for 8 years before that so probably 25k miles on the original Ultegra chainring and 9sp cassette.

Just a note, per park tool product manual 11 and 12 speed chains should be replace at .5 on the chain wear gauge.....

 

[Mathers]

I'm currently testing this for Sram ATM. So far in the Test Pool we've come up with 300 hours as a recommendation, but I'm running group until failure.

did you test the new 520% eagle

 

[Steve Vai]

did you test the new 520% eagle

No. I was picked to do the long term AXS test so didn't get to ride the 52 yet. They use me for the mileage stuff a lot.

 

[stb222]

you need one of these: https://smile.amazon.com/Bikehand-Bicycle-Chain-Indicator-checker/dp/B00811WQW0/ref=sr_1_4?crid=1ZMA1EVUNRLVT&dchild=1&keywords=chain+measuring+tool&qid=1593171847&sprefix=chain+meas,aps,159&sr=8-4

Despite using that tool and replacing the chain as required, I only got about 2500 miles out of an XX1 ring. Pretty underwhelming. Cassette is still fine.

I've never replaced a shimano chainring. I have 14k+ Strava miles on the bike I now use for Zwift and I owned it for 8 years before that so probably 25k miles on the original Ultegra chainring and 9sp cassette.

FWIW, 2500 miles is pretty good for the modern systems with large ranges. The turning point seemed to 11 spd, where I found chains needs to be replaced around 700 miles and probably need to replace the chainring every 3 chain. I think 10 spd was the pinnacle of chain / cassette / chainring wear, it is just the gear ranges werent there, yet.

 

[Norm]

Just a note, per park tool product manual 11 and 12 speed chains should be replace at .05 on the chain wear gauge.....

I think half the chains come with .05 wear new.

 

[shrpshtr325]

idk about that, but either way im just sharing what the park tool paperwork says,

also interesting to note that all of my x01 eagle chains the park tool gauge(cc-2) doesnt even fit in when new, they need to wear before it can be used.

whoops, look like i added an extra 0 in there, i see it now :O my bad.

 

[Dingo]

Just a note, per park tool product manual 11 and 12 speed chains should be replace at .5 on the chain wear gauge.....

So the brand new 11-speed XTR chain that measures .5 with the Park CC-2 is no good right out of the box?

Over the years, I've measured new shimano chains, some are too tight to measure but most are around .25 .

 

[shrpshtr325]

So the brand new 11-speed XTR chain that measures .5 with the Park CC-2 is no good right out of the box?

according to park tool that is the case, my new 9 and 10 speed chains always measured .25 at the most out of the box. I havnt seen the 11 or 12 speed chains with that much play new.

pdf for reference so you know im not making this shit up. https://www.parktool.com/assets/doc/product/CC-2_instructions.pdf

 

[Dingo]

according to park tool that is the case, my new 9 and 10 speed chains always measured .25 at the most out of the box. I havnt seen the 11 or 12 speed chains with that much play new.

pdf for reference so you know im not making this shit up. https://www.parktool.com/assets/doc/product/CC-2_instructions.pdf

I know your not making this shit up.. But it is a bunch of shit that new top of the line chains measure worn out.

 

[mfennell]

Good info. Looks like I need a new tool. Mine only measures 0.75 and 0.1.

 

[shrpshtr325]

I know your not making this shit up.. But it is a bunch of shit that new top of the line chains measure worn out.

i agree, that would be a bunch of shit, i havent had it happen to me tho, so i cannot say how common it is, maybe you got a defective chain? (who woulda thought that could happen)

 

[Patrick]

Theory. A slightly out of spec chain will work better on a slightly worn drivetrains.

 

[Dingo]

Theory. A slightly out of spec chain will work better on a slightly worn drivetrains.

Nothing like a matched set of new worn out top of the line shimano ?

friggin ridiculous, but it is what it is Gonna wait until the old chain is .7ish and then pop on the new .5