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I wasted the whole day on a damn KMC chain.....

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I wasted the whole day on a damn KMC chain.....

Old 04-08-12, 10:43 PM
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coolmingli
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I wasted the whole day on a damn KMC chain.....

I changed all my gears to Dura Ace 7900 compact from Ultegra 6700, except the chain is KMC X10SL(new), after everything was installed, the shifting was not smooth at all, I just couldn't achieve the sweet spot on cable tension, crappy shift either up or down.

I rerouted the shift cable, change the housing and ferrules, change cassette, wheels, skewer.... I did everything, I started at 1pm this afternoon, didn't even eat my lunch, until 8:30pm, I gave up, my thought was it is impossible to adjust the RD right,because I got a lemon shifter.

I kept thinking what went wrong while I was washing my hands, I decided to give it one more try, swap out the chain, I took off my Ultegra chain from my other bike, put it on, damn, I couldn't believe it, the drivetrain shifts so smooth.

It was a hard way for me to find out a chain can be so critical for good shifting, I will never buy another KMC chain again. I am exhausted, going out for dinner now.

Is there someone running Dura Ace 7900 compact 11-28 cassette and KMC chain out there? Comments are welcomed.

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Old 04-08-12, 11:06 PM
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I don't know, but I use a similar trainer as a work stand, ride a BMC and have a KMC X10 on it.

sorry I wasn't of any help.
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Old 04-08-12, 11:19 PM
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I'm running a KMC X10SL gold chain on an Ultegra cassette and Red derrailleurs, no problems. I like it so much that I will probably use X10SL on my other bikes when the chains wear out. I assume you looked for a stiff link in the chain, or maybe it was just a defective chain???
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Old 04-08-12, 11:22 PM
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Does that chain have an inside and and an outside? How about a top and a bottom?

... I'm being serious.
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Old 04-08-12, 11:25 PM
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the ultegra chain is supposed to be better.

alternatively, it could be cassette wear.
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Old 04-08-12, 11:27 PM
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Ask your local bike shop that you bought it from to see if they can help you with it.
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Old 04-08-12, 11:54 PM
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It is all good now, once I put the Ultegra chain on it, it runs so smooth, to a point made me wonder why would I want Di2.

I am sure it is the KMC chain being not compatible with 7900 11-28 cassette and Compact crank, the chain itself is fine, no stiff links, brand new.

I have seen crappy setups, but man, when that KMC chain was on that drivetrain, I am talking about crappy as hell, worse than Sora, not even, it is like something was broken, it is that bad.

I swear to god that KMC didn't do their research with this specific setup which is 11-28 rear compact front.

Last edited by coolmingli; 04-08-12 at 11:58 PM.
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Old 04-09-12, 03:33 AM
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New chain and badly worn cassette will not play nice with eachother.
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Old 04-09-12, 03:38 AM
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Running an Ultegra 6700 compact with an ultegra 11-28 cassete and a KMC chain. Works fine, it was a bit of a hassle getting the cable tension dialed in though.
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Old 04-09-12, 03:58 AM
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Chains are critical to good shifting...but...KMC makes great chains. I have run them with Campy and Shimano drivelines.
So...either your chain 'length' was wrong
or...you had a defective chain with bad or stiff links...
or...the chain width was mis-marked.
A KMC chain should shift seemlessly on your bike if properly set up.
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Old 04-09-12, 05:17 AM
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not had trouble with kmc chain but those 11-28 for some reason shift terrible ime
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Old 04-09-12, 05:34 AM
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Cool story bro...

New 6700 Cassette or "road-tested?" That tiny data point makes ALL the difference in this story.
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Old 04-09-12, 06:03 AM
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My guess is that your chain was too short and you had the B-tension screw all the way out.

-OR-

You fed it through the der incorrectly and it was actually OUTSIDE the tab on the inner pulley plate. I've seen it done.
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Old 04-09-12, 06:47 AM
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It would be interesting if you could compare the lengths of the chains, then reinstall the KMC to see if it works as poorly the second time. Just to reduce variables, apples to apples and so forth.
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Old 04-09-12, 06:50 AM
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Originally Posted by Bob Dopolina View Post
My guess is that your chain was too short and you had the B-tension screw all the way out.

-OR-

You fed it through the der incorrectly and it was actually OUTSIDE the tab on the inner pulley plate. I've seen it done.
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Old 04-09-12, 06:54 AM
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Originally Posted by Bob Dopolina View Post
My guess is that your chain was too short and you had the B-tension screw all the way out.

-OR-

You fed it through the der incorrectly and it was actually OUTSIDE the tab on the inner pulley plate. I've seen it done.
I do this 50% of the time, but catch it before the test ride. And with much cursing as I fix it.
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Old 04-09-12, 06:57 AM
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Leonard Zinn in Velonews recently said their tests showed KMC doesn't work well with Shimano.
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Old 04-09-12, 06:58 AM
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Is that the KMC chain in the pic? If so, it looks pretty short to me.
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Old 04-09-12, 07:45 AM
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With all the resources and brains in this forum, there should be a link or a chart or table that shows how long one's chain should be. There are rules to follow and tricks to determine this, but if you buy a chain with a known link-count and are running a certain combo (say 50/34 with a 12-25 cassette), then remove 'x' links. Could it be that easy?

Have to agree with simonaway though. That chain is on big/middle of the back and looks short there. If you go anywhere near big/big on this, there will be trouble.

OP, have you measured/counted links between the two chains in question?
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Old 04-09-12, 07:47 AM
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Originally Posted by RTDub View Post
With all the resources and brains in this forum, there should be a link or a chart or table that shows how long one's chain should be. There are rules to follow and tricks to determine this, but if you buy a chain with a known link-count and are running a certain combo (say 50/34 with a 12-25 cassette), then remove 'x' links. Could it be that easy?
Different chain stay lengths and der cage lengths make this impossible.
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Old 04-09-12, 07:54 AM
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Originally Posted by Bob Dopolina View Post
Different chain stay lengths and der cage lengths make this impossible.
Just add the der cage size to the equation?

EDIT: Actually, Park does have the equations, but a matrix would be much more helpful.

Last edited by RT; 04-09-12 at 08:05 AM.
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Old 04-09-12, 08:06 AM
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I installed one on my new bike in 5 minutes Saturday. Shimano 105, 12-30 cassette. Only 30 miles on it but it seeens fine. I also put one on my old bike with 11-28 and 2000 miles on the cassette. No problem either. Be intrested in if its the group. Also didnt somebody on another thread mention KMC makes Shimano chains?
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Old 04-09-12, 08:28 AM
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Originally Posted by RTDub View Post
Just add the der cage size to the equation?

EDIT: Actually, Park does have the equations, but a matrix would be much more helpful.
Yeah but it includes the length of the chain stay, as it would have to.
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Old 04-09-12, 08:35 AM
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In the name of science, how does the KMC chain shift on the bike you sourced the ultegra chain from?
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Old 04-09-12, 09:14 AM
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is chain length really that hard, though?

I thought it was just:

1. know what a link is, compared to a half-link
2. install chain in big/big combo
3. go all the way around and add one link.

if you have multiple cassettes you can do this with your largest cog and it should work ok for cassettes within 4 teeth. beyond that, you'll need a shorter chain. so if you have shimano and you have 12-27 and 11-23 cassette, you would set it up with the 12-27. and then it should be 'ok' but obviously a bit longer than ideal when using the 11-23.
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