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Post by Deleted on Oct 26, 2015 15:11:15 GMT
Which is something of a mystery, anyway, it's apparently a reasonably straightforward job to replace these (and I guess the cassette aswell?) so I'm going to save a few quid and do it myself, I'm pretty clear on the things I need. I'm doing a straight replacement with this chainset for my Triban 500 www.decathlon.co.uk/7-to-9-speed-road-bike-triple-chainset-50x39x30-id_2569409.htmland that leaves me with one question, exactly what crankpuller do I need for this? Thanks
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Post by Paulinblack on Oct 26, 2015 16:30:31 GMT
Is this a 4 month old Triban 500 that is still within its 2 year warranty? If so, why don't you talk to Decathlon?
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Post by chas on Oct 26, 2015 16:32:05 GMT
How do you know the chainset and chain are worn but don't know about the cassette? How many miles have you done in what conditions with what maintainance? The Ounce chainrings aren't the most hardwearing, if one is worn it might be worth replacing, or upgrade the whole thing if you're using it hard. I don't think replacing with the same is a good idea if you've worn it out in 4 months (which I doubt).
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Post by Rocket on Oct 26, 2015 17:03:20 GMT
I've been through 2 of the original ProWheel Ounce triple chainsets and each managed 7,500 miles. How old they are is irrelevant, as per chas it's the useage in what conditions and maintenance schedule that determine life. I have seen a chainset scrapped in a much shorter mileage because the chain running on it was worn to excess and had not been picked up on. Get a ruler and measure 24 links on the chain. If it comes to more than a 16th of an inch over 12 inches then your chain has had it. This is wear not stretch. My guess is it will be significantly more and that being the case your cassette is now junk too. There is a thread on here about crank pullers if you search. It is important you read it to avoid damaging your cranks when trying to remove them as some pullers are too big to pass through the squares on the cranks. Final point. The crankset Decathlon sell is 170mm. If you have a larger frame then your bike will have 175mm cranks. They will of course fit but you may find them odd to pedal - I did so just swap the chain rings over to keep the right length.
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Post by Deleted on Oct 26, 2015 19:08:46 GMT
Yes the chain is brutally worn. the bloke in local bike shop said it was off the scale of the measuring device. My frame is an XL btw.
as for the warranty, chain and ring count as wear don't they I think I'd be having a losing argumnt
I'll have a look through about crank pullers, but when I looked on ebay there were a number of variations, and obviously I want the correct one for this chainset.
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Post by chas on Oct 26, 2015 20:49:18 GMT
You need one for a square taper, not octolink but as Rocket said you'd be better off swapping the rings to retain your crank length. You can do that without removing the cranks.
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Post by Deleted on Oct 26, 2015 21:52:22 GMT
Thanks I may do that. (it's two chainrings that need to be changed, the middle and big one)
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Post by robertsims on Oct 27, 2015 13:21:19 GMT
And next time clean the chain regularly and change chain occasionally!
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Post by Deleted on Oct 30, 2015 9:48:26 GMT
My son rode approx 4500km on his original chainset, including 10 competitive crit races, before they needed replacement. 4 months seems vastly accelerated wear...
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Post by Radchenister on Oct 30, 2015 14:11:07 GMT
... ? I change chains at circa 1500 kms, as the chain gauge starts dropping in on the '1.0' marker by then; I've gone through about a dozen or so now since riding Deca road bikes (across winter and best bike); if I was to carry on riding the chains past that point I have no doubt that the cassette and front chainset would soon be shot. This is because the load is no longer spread across several teeth front and back and focuses on one or two (or just a few), so the point loads are stronger and wear rate accelerated; I'm a clean freak, the chain is rarely anything less than gleaming and freshly lubed, so the additional wear from grime is minimised but for the sake of balance, should say that my lightweight son barely loads his, so that is a factor. However, I'd have thought that wearing down a chainset in 4 months is entirely possible, particularly if ridden in all weathers without changing chains and cleaning often.
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Post by william39 on Oct 30, 2015 14:53:50 GMT
I change chains at circa 1500 kms Just out of interest how often do you change the cassette? Since I went ten speed I've done about 4000km and still on original chain (Ultegra) with Tiagra cassette. I expect now no point changing chain wthout changing the cassette due to wear. All is still working well with no skipping so I am tempted to keep everything in place over the winter although I might be damaging the front chain rings? My Tiagra chainset must have about 8000km on it now.
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Post by r0b1et on Oct 30, 2015 15:46:57 GMT
I change chains at circa 1500 kms Just out of interest how often do you change the cassette? Since I went ten speed I've done about 4000km and still on original chain (Ultegra) with Tiagra cassette. I expect now no point changing chain wthout changing the cassette due to wear. All is still working well with no skipping so I am tempted to keep everything in place over the winter although I might be damaging the front chain rings? My Tiagra chainset must have about 8000km on it now. I'm over 4500km on original 11s 105 chain on my Rose and she doesn't even think about dropping into the 0.75 thingy on the gauge... the replacement is waiting, but it won't go on until it needs to. But that's the good bike and shes only ever seen rain twice (when I got caught out) and is cleaned a little too much for my own sanity.
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Post by Radchenister on Oct 30, 2015 16:24:05 GMT
I think if it's all running sweet and tight then there's nothing to worry about, my chains are OK on the gauge for quite a while then all of a sudden seem to allow the '1.0' measure to drop in on some spots (best check around the whole chain, not just in one spot and measure over the split link, as they go as well over time). The gauge doesn't lie on when to change them, I don't faff once it's looking iffy, even if there's just a short section that drops the gauge in I change it anyway. I'm on second rear cassette (11-28, 105) on the FC700, it's still going pretty well, Strava tells me the carbon has done 5860kms, I only changed to the 11-28 for gearing reasons after about 2000kms (moving away from 12-30), not because the cassette had had it. I believe my cassette and chainset wear is low as a product of changing chains regularly; the way I see it, if the chain's still meshing well, spreading the load via engaging with most of the teeth on both front and rear cogs, then there's not so much point load available to eat away the cogs and if the dimensions are sweet, then there's minimal movement to work in friction (keep it clean and there's less chance still).
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Post by Radchenister on Oct 30, 2015 16:27:33 GMT
Oh, and I've had a mix of 105 and Ultegra chains, depending on what's in the sales - can't say I've logged their distances precisely, I just know I'm changing them fairly regularly. For Β£12 or Β£13 they're cheaper than a round down the pub.
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Post by denkfaul on Oct 30, 2015 19:40:01 GMT
I'm over 5000kms on an original 105 11s chain as well, with no signs of it dropping into the 0.75 section on the tool. It does feel a bit odd as previously I was replacing my 9speed chains every 1500-2000kms, even though I was maintaining them a lot better, as I can't remove the 11 speed I'm being far less thorough with it than I used to be. Maybe removing, soaking and scrubbing chains every couple of weeks wears them out more than not? Or maybe the new 105 chains are that much better quality? Who knows, I only offer anecdotal evidence.
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