Chain to cassette ratio....

by Al'76   August 11, 2013  

Now, I was under the impression that if a chain is changed in time you should be able to get through at least a couple of chains before you need to change the cassette. I use a Park Tools Chain Checker (0.5 & 0.75), order a new chain at 0.5 and then swap it out at 0.75.
LBS mechanic tells me I should be changing cassette every time I change chains; really?

14 user comments

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Technically speaking you should change both as you will find the new chain will wear out faster. That said it’s a rather expensive way of doing things and if perfect meshing isn’t high on your list i.e. pro racer I wouldn’t worry about it and carry on the way you are doing it two chains per cassette. No doubt someone else will give you different advice but it works for me.

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posted by cidermart [456 posts]
11th August 2013 - 11:08

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Why not have 2 chains per cassette and swap them over at regular mileage intervals then the wear on the cassette will be more in line with that on the chains.

posted by Benway [65 posts]
11th August 2013 - 11:20

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If you change at 0.75 you don't need to change the cassette.

posted by simeond [20 posts]
11th August 2013 - 11:59

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you should get 2-3 chains out of a cassette if you change at 0.5 but i would ersonally change at 0.75 and just get 2 chains off one cassette.

your other option is use them until it skips and then replace it, depending on your mileage and how often you ride its not normally that more expensive to replace it once its skipping.

6 and half a dozen tbh

posted by Lost faith in t... [119 posts]
11th August 2013 - 12:25

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I'm liking 2:1 @ 0.75 Thinking
Thanks all.

posted by Al'76 [126 posts]
11th August 2013 - 13:27

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I've found 2:1 works perfectly well on my 9 speed Tiagra cassettes with SRAM chains provided you change it as soon as it reaches 0.75 (if not before).

Using a ruler: 10 links = 25.4 cm when new. Up to 25.5 cm is OK. A bit past 25.5 cm you should replace the chain, the cassette should be fine. If it is near 25.7 cm you have left it too long, and the most used sprockets will be too badly worn.

Always put your chain under tension to check it.

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posted by Simon E [1906 posts]
11th August 2013 - 15:13

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lbs wants you to buy more stuff - big surprise!

I stocked up on some quality sram chains from planet x when they were on offer and happily continue to use the same cassette on the second chain.

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posted by TheHatter [810 posts]
11th August 2013 - 19:50

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If i had to change the cassette every two chains, it wud cost me a fortune as chain changed after 1200 miles ie 2 months. Not a hope in hell, okif u hav bottomless pockets

posted by issacforce [203 posts]
12th August 2013 - 2:08

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Also to my ladt post had a cassette on bike for 6 yes 6 years jst changed chain regually and worked great, imo its a moneymaking racket brought about by manufacturers to make more money,

posted by issacforce [203 posts]
12th August 2013 - 2:12

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Change cassette every time if you wear out your chain before you change it. If you change the chain before it has gone too far you can get a few chains out of a cassette. You will know if the cassette has gone if a new chain skips on it or if your chains start wearing out quickly. It's best to find a chain that suits you, I find that some higher end KMC and lower end SRAM models seem to wear out in no time when I use them. I find that Campag chains on Campag kit last a really long time.

Ah! Condor

posted by Bedfordshire Clanger [307 posts]
13th August 2013 - 12:16

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could do what i am doing, finding out how long a chain can last...

currently somewhere in excess of 11,000miles over the last 18months.

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posted by mrmo [1023 posts]
13th August 2013 - 16:37

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mrmo wrote:
could do what i am doing, finding out how long a chain can last...

currently somewhere in excess of 11,000miles over the last 18months.

You could do, but you would end up trashing chainset, cassette and jockey wheels in the process.

It will be expensive when you do come to replace the lot.

Ah! Condor

posted by Bedfordshire Clanger [307 posts]
13th August 2013 - 16:46

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Did that on the Allez; that's got Tiagra so the new drivetrain (chain ring / cassette / jockey wheels / chain) hurt but I got over it....trying to avoid doing the same with Ultegra as that will hurt more Surprise

posted by Al'76 [126 posts]
13th August 2013 - 17:07

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Yep, the more expensive kit you use the more cost effective the regular chain replacement approach becomes. On lower end kit the cost pretty much evens out.

Ah! Condor

posted by Bedfordshire Clanger [307 posts]
13th August 2013 - 17:48

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