"KMC chains strongly not recommended" – Why?
Quotes from the manufacturer:
And one more – please do not use KMC chains. They are out of spec in term of links dimensions and will make you trouble with my rings. Sram or Shimano chains are best for that.
PLEASE check with sram/shimano chain. 99% of problems is due to KMC chain. They are out of spec by 0.05mm on the link and this is well enough if yuo count mud and 10links for eg. I had few customers with that and when they switched to different chain it cured the issue mostly (except clay mud)
Weirdly none of the other rings have any problems with KMC- mine is one of the first gen Works ones and has always had KMC on it, still never dropped when riding. So, IMO the solution isn’t to avoid KMC chains, it’s to avoid these chainrings as they’re pointlessly fickle. If they have issues with specific chains, what else are they going to have problems with- mud, chain wear, quick links?Posted 4 years agojulianwilsonMember
irc there was a nice explanation on here from someone in the industry a few years back about how it can arise that your product and a compatible or right-size product are at the opposite ends of what is usually an acceptable ‘tolerance’. No one stopped using inbreds or 27.2 thomson seatposts though iirc.
From the implications of posts above, it does seem strange however that kmc might use different tolerances/tooling for their own chains than they do for the ones they make for shimano though.Posted 4 years agothisisnotaspoonMember
From the implications of posts above, it does seem strange however that kmc might use different tolerances/tooling for their own chains than they do for the ones they make for shimano though.
Apparently they only make some shimano chains.
The higher end shimano ones are made in house, which I presume would now include 10speed.
Ive almost always used KMC with less problems than SRAM or Shimano. Not on N/W rings though.Posted 4 years agochiefgrooveguruMember
Weirdly none of the other rings have any problems with KMC- mine is one of the first gen Works ones and has always had KMC on it, still never dropped when riding. So, IMO the solution isn’t to avoid KMC chains, it’s to avoid these chainrings as they’re pointlessly fickle. If they have issues with specific chains, what else are they going to have problems with- mud, chain wear, quick links?
Exactly. The gold KMC ones are particularly good when you ride in all weathers, very corrosion resistant.Posted 4 years agocblair246Member
Marcin @ absoluteblack here.
I got the link from someone to see that thread. Funnily enough there was so many people looking at my web that it crashed few hours ago. Now is fine though.
So to give few explanations.
When I write that KMC chain is not good with my rings there is a legit reason for it. If someone thinks that only absoluteblack rings have some restrictions then go to WT website and you will see that they don’t recommend Wippermann chains for this matter.
So where is the problem? To be very specific it is with chain rollers in KMC chains. They are bigger than industry standard. This causes clogging with the teeth while meshing. Why? Because our rings are designed to tightest tolerances possible to retain the chain as well as it is physically doable. This also means that any anomaly in the chain will create trouble.
Why others do not have that problem? Because their tooth pattern is more pointy(triangular) and chain is sitting very loose compared to ours. Original xx1 rings have recessions squared off (which is protected by patent) and this helps kmc chain to work by “accident” as it leaves more space.
Where we are now. KMC has recognized the problem and we have been involved in testing new chains:) In few months all chains will be corrected and new spec will enable them to run with our rings. We will also become an ambassador of KMC and will offer them on our website..
Here is an independent review testing new KMC chain and our Chainring:
If you have any questions you can always write me on Fb or emial as i am not here so often.
We will launch very soon few new rings. Sram spiderless with narrow/wide teeth (as many people asked), 40T cassette cog, 64BCD rings in 30,28 and 26 and also few more very interesting products.
you can follow Fb for the news:
MarcinPosted 4 years agoandytherocketeerSubscriber
I only ever use KMC chains now after a Shimano one snapped on me.
I only ever use SRAM chains now after a KMC one snapped on me.
4 of us bought KMC chains. All 3 normal ones snapped after hardly any use, with mine snapping after 152.8km of essentially riding round town and towpath levels of gnar! One gold one, I believe is still going. All 4 chains bought around the same time, but from different suppliers. And yes we did wonder whether there was a supply of fakes out there.
Very subjective I guess, but with stats like that, it’ll take quite a bit of convincing to defect from SRAM, where I change chains at 1000km+ because I feel like it, not because they’re measurably worn.
Not on a 1×10 though yet, but considering it.Posted 4 years agovincienupSubscriber
I (irrationally) won’t use Shimano chains simply because of the joining system. Yes I know you can use a third party quick link. I’m sure they do, also which is my point.
I stopped using SRAM 10sp chains when having issues making a particular setup work. Now have KMC on three 10 speed MTBs and have done for over a year with no issue whatever – Shimano, Hope and RF rings. I’m using SRAM 9speed and very happy with 991’s on Cross.
I almost see the point here, but if other extreme grab rings are fine and absolute blacks’ are picky they need to demonstrate performance advantages over all less picky competitors IMO. Personally a Hope IBR with no devices or tricks works in 1×10 for me. Kudos to the guy if he’s got KMC to retool to suit him.Posted 4 years agoIanWMember
I notice lots of new bikes come with KMC chains regardless of the group set mix , I presumed this was the chain of choice for one or two big Far East factories.
Only first hand experience was the one that came on my new bike last year, the SRAM I replaced it with did seem an improvement but then the old one had a 3k miles on it.Posted 4 years agoendurokidMember
I’ve been using a10sp KMC gold chain for about 6 weeks now and have had no issues, I’m running it with a clutch mech, NW and no guide. The only thing I’ve noticed is it’s quite noisey in the lowest gear, I’ve been told this is the trade off for not running a guide as the NW ring exaggerates the chainline.
After reading this thread I nipped to the shed and popped on my XT chain, I’m riding Sunday so will see the difference between the two chains.Posted 4 years ago
tehan – Member
Thanks Andrew (Northwind) for your informative comment. I guess you must be an expert in drivetrian.
I know what works thanks, as I say I have put enough miles onto a Works chainring with KMC chains to know that it works perfectly, so regardless of where the fault lies there are other products that just don’t have this issue, and it makes more sense to go there. Exacting tolerances are always great til you get into the world.Posted 4 years ago
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