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Shimano 12 speed cassette longevity

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#41 ·
I rotate every 500 miles. Chain is soaked in degreaser, blown dry, then lubed and put away.
I hung the 1000 miles chain and it has absolutely zero stretch compared to when it was new. The rollers might be wearing, but because everything wears together it works for longer without skipping.

My plan was to run 3 chains, but the with no measurable wear (roller or length) after 500 miles I decided to go with only 2.

Cassette is holding up very well. Front Wolftooth chainring is probable going to wear out first. I would prefer a steel one, but no one makes one.

Using Finnish line dry teflon lube.
 
#42 ·
FRAJ said:
I agree it doesn't seem right, and I've kept the old cassette and may do some mix and match with other chains to see what happens. Otherwise this hobby is too expensive...,
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This may be a dumb question but did you take your bike into a shop and have them check your chain? There’s some finesse required and a lot of the chain checkers can accidentally be forced to show that they have excessive wear….

after over 2500 miles my mtb chain JUST hit .75 wear. I’m switching to waxing now and have multiple chains to swap
 
#43 ·
Swolie74 said:
This may be a dumb question but did you take your bike into a shop and have them check your chain? There’s some finesse required and a lot of the chain checkers can accidentally be forced to show that they have excessive wear….
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I checked it myself, and agree a drop in checker can easily over estimate wear, but the fact is that it had some wear and when changed to a new chain the [3 month old] 10t skipped badly but is perfect with a new cassette. I can't really understand why - Like I said earlier, when I have gone back and looked at the chain there is no discernible actual extension and comparing the old and new 10t I can't see any difference.
 
#44 ·
I ditched Shimano because of the quickly wearing 10t cog. It would skip/slip during a hard effort. Theoretically, you can buy them separately so you don't need to buy a whole new cassette, but they were impossible to find in stock.

First chain replacement at .5 wear, skipping 10t cog
Every. single. time.
Was a Shimano fanboy for years. AXS and X01 fan now.

Shimano brakes do rule though.
 
#46 ·
Yes, quite sure. Bike mechanic 27 yrs.
You can actually see the metal deformation on the rear side of the cog teeth.

Was also an issue with my 11t cog on my11spd setup, but 11t cogs were easy to get: and it would take longer to get there. The 10t wears faster.
 
#47 ·
MTB Engineer said:
Are you guys sure you’re not running a too long chain or incorrect B-tension? Both will also lead to skipping on the 10t.
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I just checked my B tension and it was a little off so wound 1 turn out to correct it. Until you mentioned it I assumed it would be right since it's all quite new.
Following on from my previous posts, I have just put another new chain on after ~350 miles, and the 10t is slipping again. No different after changing B screw. It's a repeat of what happened before and I don't know the best thing to do now - don't want to blow another ÂŁ130 on a cassette and can't buy the individual cogs anywhere but Ali Express (tried it before and they never arrived).
 
#48 ·
Just to update, in the opinion of my local shop who are Shimano approved: They have seen this issue, but more on E-bikes. The 10t is just not up to the job if used a lot of the time and with low cadence. So I need to pedal faster in a lower gear, and by increasing the size of the front ring I would use the 10t less. It makes sense, but I still think Shimano have a product which is not good enough - especially for that money.
 
#49 ·
10t not holding up at high torque / low cadence is not Shimano specific. Generally 10 is a very low tooth count for chain drives as the wrap angle becomes very high and contact ratio is low.

I just put a new chain on an XT cassette with >6000km and the 10t would occasionally skip on the first ride. Subsequently it has been fine again.

I’m not sure about Deore/SLX level but XT/XTR 10t cogs are noticeably harder than the rest. Tested with a diamond file.
 
#55 ·
HightowerBikes said:
Im only getting around 350 miles per slx7100 chain
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alexbn921 said:
I have over 700 miles on an XT chain with almost no measurable wear. And it's on a 55lb ebike.
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FRAJ said:
Same for me - 350 miles before the wear indicator suggests replacement, which I am about to do for the second time with an M7100 chain.
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Sorry for resurrecting old posts, but just to note that I can concur on all these observations.

On a full-fat eMTB:

The stock SLX CN-M7100 lasted 350-400 miles (N=2)

An XT CN-M8100 is lasting 800 miles and hasn't worn out yet (N=2)

The XT chain seems to be significantly more durable than the SLX chain.
 
#56 ·
As an update I broke a link on the 1500 mile chain and kept it as a backup.
Other on is now over 2200 miles. Still going strong.
Cassette is wearing great too. Front wolf tooth ring is probably the most worn of everything.
 
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