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Chain Wear
Just got my Trek 7200 back from the bike shop after a service. They mentioned that is had "50% chain wear". I didn't have the forthought to ask how long before I'd need to replace the chain. Is it a straight linear relationship between km cycled & chain wear (I've done 5000 km or so to get to 50% chain wear ... so another 5000km to 100%??). Do you wait to 100% before you replace the chain? Or some other number? Thanks! H -- cirrus |
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#2
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Chain Wear
cirrus wrote:
Just got my Trek 7200 back from the bike shop after a service. They mentioned that is had "50% chain wear". I didn't have the forthought to ask how long before I'd need to replace the chain. Is it a straight linear relationship between km cycled & chain wear (I've done 5000 km or so to get to 50% chain wear ... so another 5000km to 100%??). Do you wait to 100% before you replace the chain? Or some other number? Thanks! H Greetings, This is an old one. Put the chain onto the largest front chain ring. Take a screw-driver, or key or whatever, and place it under the edge of the chain at the leading edge of the chain wheel. See how far you can lift the chain clear of the chain wheel teeth. If the answer is more than 1 cm, it's rooted. Simple as that. It has stretched itself out of existence. So have fun getting it replaced if this is indeed the case. Regards, Ray. |
#3
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Chain Wear
cirrus wrote: Just got my Trek 7200 back from the bike shop after a service. They mentioned that is had "50% chain wear". I didn't have the forthought to ask how long before I'd need to replace the chain. Is it a straight linear relationship between km cycled & chain wear (I've done 5000 km or so to get to 50% chain wear ... so another 5000km to 100%??). Do you wait to 100% before you replace the chain? Or some other number? Depending on the performance you want from your drivetrain, expecting 10,000km out of a chain is possibly a little over-ambitious As the chain wears (it doesn't stretch, the rollers wear away) it elongates, and thus doesn't mesh properly with the gears on the bike. This leads to wear on the gears you use the most, and poor performance on the other gears and until such time as things start to jump and skip this is probably bearable - you're riding a hybrid, it's odds-on you're not sprinting or anything likely to cause chain skip etc until it's *very* worn. The decision re chain replacement comes down to a compromise between regular (say every 2 or so thou) chain replacement, which preserves your gears for longer, or let the chain wear to the point of death, and then replacing all the rest of the gears at the same time. So it's up to you, regular chain replacement (which you can easily do yourself) or less regular but much more expensive replacement of most of the drive train. It sounds simple except that by replacing the chain you don't get infinate life out of the gears (alas!), so you'll still have to replace them every now and then, but less often than if you let the chain go all the way. The decision is swayed by the sort of riding you do and your preference. |
#4
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Chain Wear
Bleve wrote:
The decision re chain replacement comes down to a compromise between regular (say every 2 or so thou) chain replacement, which preserves your gears for longer, or let the chain wear to the point of death, and then replacing all the rest of the gears at the same time. Yeah, better earlier than later. I replaced my chain on my winter commuter which has only done 3500kms. I'm now getting skipping when jumping hard in my cruising gear. Guess I didn't replace it early enough. -- ..dt |
#5
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Chain Wear
cirrus wrote:
Is it a straight linear relationship between km cycled & chain wear (I've done 5000 km or so to get to 50% chain wear ... so another 5000km to 100%??). Do you wait to 100% before you replace the chain? Or some other number? Listen to the good advice already given, and then read this too. Oh, and bookmark this site. http://www.sheldonbrown.com/chains.html -- ..dt |
#6
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Chain Wear
"cirrus" wrote in message ... Just got my Trek 7200 back from the bike shop after a service. They mentioned that is had "50% chain wear". I didn't have the forthought to ask how long before I'd need to replace the chain. Is it a straight linear relationship between km cycled & chain wear (I've done 5000 km or so to get to 50% chain wear ... so another 5000km to 100%??). Do you wait to 100% before you replace the chain? Or some other number? They may be mis-using the Park Tools Chain Checker. I have one of these devices and it's fantastic. It recommends replacing a chain before it's 1% elongated. Your chain may be 0.5% elongated and therefore 'half way to buggered'. That said, most Shimano chains start off with 0.25% elongation from new :-) |
#7
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Chain Wear
Gemma
This topic gets a run pretty often. If you do a search for 'chain' you will find the earlier threads. Donga |
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