Chain snap!!

[GrumpyGregry]

Quick question. Once the chain is at or just under .75 then can you get away with just a new chain keeping the cassette.

Yep. Chain tools, that stretch the chain, are, according to our learned friends, inherently conservative in measuring wear; they overestimate it. I've never had a cassette problem by binning chains at 0.75 as indicated on one... but by the time it gets to 1.00 it is bye-bye cassette.

 

[400bhp]

Yep. Chain tools, that stretch the chain, are, according to our learned friends, inherently conservative in measuring wear; they overestimate it. I've never had a cassette problem by binning chains at 0.75 as indicated on one... but by the time it gets to 1.00 it is bye-bye cassette.

My understanding/experience is that the cassette needs replacing every 3rd chain. Is this your/other peoples' experience/understanding?

 

[GrumpyGregry]

My understanding/experience is that the cassette needs replacing every 3rd chain. Is this your/other peoples' experience/understanding?

more or less yes. on mtb's without rebuild-able cassettes I've had to cassette swap sooner.

 

[totallyfixed]

No hard and fast rule here, much depends on the type of riding you do /when you do it /dry / wet / how powerful you are / hills, etc etc etc and that's not even taking into account the varying quality of the components. As an example I ride a big gear fixed most of the time with a 3/32 chain and I go through at least 6 chains per year but rarely have to change the sprocket, bearing in mind that all the wear is on that one sprocket.

 

[I like Skol]

What on earth are you doing to your chain Potsy? Even I can get around 2000 miles out of a 10 speed Shimano chain.

The first chain on my hybrid only did around 400 miles before wearing to the 0.75% point . I had already ordered a replacement but I suddenly started experiencing really rough running/jumping. As it was dark when I commute I simply plastered the chain in oil for the last night and planned to swap the chain on my days off. When I looked at the chain in daylight I found this-

I guess I was really lucky to do the 20 miles on that last trip? The replacement has since done over 2000 miles with very little wear but has suddenly gone past the 0.75 marker in the last month. I think as soon as the weather turns cold and wet and the roads get gritted it is fatal for chains. I am just waiting a couple of weeks to hopefully see the last of the gritting season before fitting the new chain and in the meantime I have increased the frequency of lube applications.

 

[HLaB]

Chain measurers seem to over-estimate IME, if you are cleaning and lubing the chain cassette regularly. I replaced my last chain at 3900 miles when it was over 1% three weeks ago and to my surprise the new cassette was never needed and there's been no skip in 400 miles.