[Closed] WTF KMC????

It's the split link by the looks of things.

Incorrect installation?

Probably only one side was connected properly.

Dunno. Fitted by Cannondale not me. Looked fine on Saturday when I lubed it. Was fine yesterday when I rode it and again this afternoon. Didn't hit the chain on anything.

Weird as…

Worrying

Indeed. Going to be a sleepless night tonight.

I have the same chain on my bike. I'd better keep an eye on it.

Jamie - Member
Worrying
Indeed. Going to be a sleepless night tonight.

Nah.
Angst is over.
Had a glass of wine and got the hybrid ready for tomorrow and will pick up two spare missing links for next time.

Same thing happened to the KMC on my road bike. Binned it.

I misread the title and thought this was going to be about deep-fried chicken offcuts.

Is disappoint.

Same thing happened to the KMC on my mountain bike that had only been used for about 100 miles of tow path spec riding. Binned it.

But in my case, NOT the quicklink, but a random link somewhere else.

Same thing happened to 2 friends KMC chains at about the same time.

[img] [/img]

My son and I both had the KMC chains snap on our 5 month old BMXs. His has definately not had any abuse. His was a regular one, mine a half link, both fitted as standard on our completes.

Happened to the KMC chain fitted to my Trek after about three months(150miles approx)fitted a Shimano chain after that no more problems 8)

Wow. I thought KMC were the new SRAM?

andytherocketeer - Member

Same thing happened to the KMC...
But in my case, NOT the quicklink, but a random link somewhere else.

So, not the same thing...

It's the same with any chain fail, they're always likely to break fairly quick, because pretty much all chains are strong unless there's a defect. So you go "Man, that only lasted 50 miles, it must be rubbish" but it can happen to any of 'em and the next one might last forever.

(most Shimano chains are made by KMC incidentally, just to Shimano's inferior spec 😉 )

I have a KMC 10sp quick link. No dramas so far after 300ish miles.

...but then I did install it properly 😛

Looking at both pictures the chains seem very dirty, do you clean and lube regularly ?

budwozza - Member
Looking at both pictures the chains seem very dirty, do you clean and lube regularly ?

Cleaned and lubed on Saturday.

Edit: Are you a roadie? For an MTB chain they seem reasonable to me.

i'm sure all 3 brands are the dog's danglies and a load of rubbish at the same time.

mine was installed correctly.

tbh since I know several others who had KMC ones go at the same time, we did wonder if there was a batch of fakes out there. all have gone within 100-200 miles of easy riding. the OP is the first one I've seen where it was the quicklink that failed. had other brands go mid way between join too.

do you clean and lube regularly ?

😉

Looking at both pictures the chains seem very dirty, do you clean and lube regularly ?

They look very clean for mtb chains to me.

Looking at both pictures the chains seem very dirty, do you clean and lube regularly ?

edit: and it snapped my multitool chain breaker (which had already been weakened fixing someone else's chain). I now carry a proper chain tool.

fortunately my emergency spares kit contains a €2 coin for the tram, and the app for the local transport co. which navigates you to the nearest tram stop (and lets you buy e-tickets too)

yea, not the best links
[img] [/img]

Oh dear, what am I to do?

I was sure, I had been told, by a reliable source (the STW Massif) that KMC Chains were the answer to all the worlds problems. Now this happens. This is how melt downs happen.

Just as well I run Shimano having drawn my own conclusions some time ago.

100+ links on every chain, on every bike. It's really not going to take long to make one duff pin or plate that will fail early in life, even with 6sigma levels of manufacturing quality.

Just take one link out and don't worry about it.

been using KMC 9 and 10 speed chains on various bikes for some years, both road and mountain

no issues to report?

fit a lot of KMC chains at work too...seen very few, if any come back with any problems.

Seen many more broken shimano chains over the years, and even broken SRAM chains

Make of that what you will?

used kmc 8,9 and 10 speed chains for ages without any issues at all ...
popped an 11 speed on the road bike (all campag) and within 100 miles
ping off it went into the undergrowth with a failed link. got home and
fitted a second, spare, 11 speed chain and rode for 3 miles thinkng
this ain't right ... back home and investigate to find that there was a
roller missing. the chain was still intact, no missing or bent bits
just no roller !!!!!!

now use shimano on the mtb and proper campag on the road bike !

as I said...

i'm sure all 3 brands are the dog's danglies and a load of rubbish
at the same time

will update when I break a SRAM chain.

play it safe and go belt drive 😉

Funny that, the x10 on my Anthem lasted 2600km before it was stretched to buggery and had knackered the whole drive train. Including a severe lack of cleaning and a lot of caning

Been using KMC exclusively with no issues for about 10+ years and before that Sram issue free.
KMC do manufacture a lot of big name brands chains so I'd like to think they know what they're doing, you are going to get the odd faulty one with any brand.

I've used KMC (x9 sl) for years without any issues. I guess they've all got the potential for failure and I guess we all develop prejudices based on our individual experiences.

8 speed KMC on my road bike went on Friday-quick link as well. Stupidly hadn't thought Road chains broke very often so didn't have chain tool...

I've blown and twisted links on shimano, sram and kmc chains. What's your point caller?

[img] [/img]

I think KMC have been fine until recently. Something is wrong at the moment though. Lots of reports at the LBS of the OE KMC's on 14 Giant road bikes failing.

I've had two failures similar to the OP in recent months. all bought on ebay. Would anyone fake quick links?

I should add that after our two failed I replaced them immediately with.... another KMC chain, KMC510HX, of which I've never had an issue over many years of abuse.

play it safe and go belt drive

[url= http://singletrackworld.com/forum/topic/belt-drive-i-t-may-be-time-to-admit-defeat ]Ahem[/url]

[i]"[u]Ahem[/u]"[/i] [img] [/img]
For what it's worth, I use a KMC Z610 on my Lynskey and tandem.
I haven't broken one yet.