Herbertlemon102 Posted October 5, 2014 Report Share Posted October 5, 2014 My KMC chain has snapped for the third time since February- first time I was uninjured, second time I was doing a gap to front and it snapped as I kicked, causing me to fall on my face, third (and just now) I was dropping off a high ledge, and am now covered in cuts and multiple bruising from the fall, and then the bike landing on me. This KMC is the one that has 5 star ratings everywhere- have I just got a dodgy one? I bought it from tarty after reading reviews- my chain tension is sorted (as we know) and I can't find any reason why it would snap. It's oiled, cleaned and free of rust. Am I just unlucky? Quote Link to comment Share on other sites More sharing options...
niconj Posted October 5, 2014 Report Share Posted October 5, 2014 So you're basically saying that you haven't switched the chain after the first two accidents? Quote Link to comment Share on other sites More sharing options...
Herbertlemon102 Posted October 5, 2014 Author Report Share Posted October 5, 2014 (edited) I have a spare half meter set if links from the same chain, which I then take links from and replace into the chain that goes on the bike. I always replace at least 5 links in case the surrounding links were damaged from the snap. And it's always a sheared link, the metal actually snapping, not a pin or something of that ilk Edited October 5, 2014 by Herbertlemon102 Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 5, 2014 Report Share Posted October 5, 2014 sorry,but a chain which snapped does belong to the bin,mate.put a new chain on and youll be fine for months again Quote Link to comment Share on other sites More sharing options...
niconj Posted October 5, 2014 Report Share Posted October 5, 2014 sorry,but a chain which snapped does belong to the bin,mate.put a new chain on and youll be fine for months again This! Quote Link to comment Share on other sites More sharing options...
dann2707 Posted October 5, 2014 Report Share Posted October 5, 2014 Bullshit ^ To both of those two posts above me. I'd be looking at seeing if your chainline is perfect before doing anything else! 2 Quote Link to comment Share on other sites More sharing options...
Perez Posted October 5, 2014 Report Share Posted October 5, 2014 Yes, re-check chainline and always check if the pin is in the right position when you link it. 1 Quote Link to comment Share on other sites More sharing options...
Filo Posted October 5, 2014 Report Share Posted October 5, 2014 (edited) What chain are you using aswell? Check chain line Check teeth on sprockets Are you over tensioning? What gearing are you using? There can be a few contributing factors. Edited October 5, 2014 by Filo Quote Link to comment Share on other sites More sharing options...
Herbertlemon102 Posted October 5, 2014 Author Report Share Posted October 5, 2014 What chain are you using aswell? Check chain line Check teeth on sprockets Are you over tensioning? What gearing are you using? There can be a few contributing factors. chai line is slightly out (very slightly) normal tension. Has been very tight in the past (due to an eccentric ffw) could be that Quote Link to comment Share on other sites More sharing options...
Mark W Posted October 5, 2014 Report Share Posted October 5, 2014 How old are the sprockets/freewheel that you're using, and which ones are they? Quote Link to comment Share on other sites More sharing options...
craigjames Posted October 5, 2014 Report Share Posted October 5, 2014 chai line is slightly out (very slightly) normal tension. Has been very tight in the past (due to an eccentric ffw) could be that Nigh on all FFW and fixed cogs run slightly out of concentricity and as far as i'm aware it's the person that sets the tension that dictates how tight it is.... You set the tension too tight. It's probably a combination of it being run too tight for a period of time, age of other components and maybe the chainline. But if it's only ever so slightly off that won't make a massive amount of difference. You say it's a 5 star rated chain, but what model of KMC chain is specifically? Can't remember the last time i snapped a chain (jinxed myself now), for the sake of £10 every 4-6 months it's worth changing. Quote Link to comment Share on other sites More sharing options...
Herbertlemon102 Posted October 5, 2014 Author Report Share Posted October 5, 2014 How old are the sprockets/freewheel that you're using, and which ones are they? echo sl 108 tensile rear. Old echo sl model (the good ones!) Quote Link to comment Share on other sites More sharing options...
Mark W Posted October 5, 2014 Report Share Posted October 5, 2014 How old is the Tensile sprocket though? Have you checked the teeth aren't hooked/worn? Quote Link to comment Share on other sites More sharing options...
Disc.Jokie. Posted October 5, 2014 Report Share Posted October 5, 2014 aren't you meant to change your chain every 3 months anyway? i know i do and people who i ride with do as well Quote Link to comment Share on other sites More sharing options...
gage-mann Posted October 5, 2014 Report Share Posted October 5, 2014 A chain is not a part to skimp on and a decent mid/lightweight chain should be changed 3-6 months. if it's lasted since February £12 is well worth paying for either a replacement of what your running or a tank like chain(if it fits) Quote Link to comment Share on other sites More sharing options...
Herbertlemon102 Posted October 6, 2014 Author Report Share Posted October 6, 2014 How old is the Tensile sprocket though? Have you checked the teeth aren't hooked/worn? not that I can see.. It is quite old though. I'm definitely replacing it after this snap anyway Quote Link to comment Share on other sites More sharing options...
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