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10 speed chain breaking

Old 06-10-13, 07:12 AM
  #1  
merlinextraligh
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10 speed chain breaking

This weekend riding in Tsali, I rented a Specialized Epic Comp 29'r with SRAM X7 components (X9 RD) 2x10 gearing with a KMC 10 speed chain.

Really nice bike that wokred great, except the chain broke twice. First time, in the small chain ring, in a middle cog on the back, climbing seated, not shifting, and not going very hard.

Second time, broke in a idfferent spot, again small chain ring, middle cog. This time standing but not really hammering.

My thought was that it's a rental bike, gets lots of use, and the chain was just shot.

Mechanic at the rental shop said that they had a lot of trouble with chains breaking on 2x10 setups, that the torque on the small ring would break the chain and it was best to stay out off the small ring in all but the largest cogs in the back.

Sounds like BS to me. But its made me think about the durability of 2x10 before I buy a bike with that setup.
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Old 06-10-13, 01:52 PM
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*shrug* I've been on 10speed for a while now, on several bikes that are not ridden gently. No issues.

The only thing is - you can NOT break the chain and re-assemble with a chain tool - you've got to use a quick link or something. Re-using the same link that you've taken apart WILL create a weak area that will generally break. I figured that out after the first couple rides, after having to tweak my chain length.

Since then, sticking to the quick link only rule when putting a new chain on, or messing with the old, I've had no issues in over a year.

Of course rental bikes have their own issues. If they've been ridden by hacks who ham-fistedly force shifts, it's gonna' lead to broken chains.
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Old 06-10-13, 05:52 PM
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I have a 9 and a 10 speed bike. But I keep my stuff in pretty good condition. I thought that weak chains might be a weakness when they first came out. But the skinnier chain is actually stouter. By about .001 of an inch.
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Old 06-10-13, 07:14 PM
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Long shot, but it is possible that an extreme chainline could cause some rubbing to the heads of the pins and then eventually breaking.

Chains don't just randomly snap, unless you happen to be Superman.

I've never snapped a 10sp chain.

Sucks that you had some mechanical problems, but I'm sure you still enjoyed Tsali...I need to get out there this summer.
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