Dec 9, 2003 4:31 PM
|I have a Record-10 equipped bike with a Ti/steel cassette and a Wippermann stainless chain. The first chain was probably kept on the bike way too long (7000 miles, even tho' it did NOT exhibit much stretch) but when replaced, the new one skipped on certain cassette cogs. Conventional wisdom suggests the extended use of the chain wore the cogs but opinions on this issue have varied widely. My gearing set-up (53/42/30 and 11-21) does result in my using the Ti cogs more than manufacturer's predictions. Four questions: (a) how long should I get out of a Wippermann stainless (b) how long per cassette (c) is longitudinal chain stretch truly a good indicator (d) could there be a differential material incompatibility (Ti/stainless). Sorry bout the long note . thanks for any advice. William|
|no correct answer...||C-40|
Dec 9, 2003 5:10 PM
|There is no firm answer for the life of a chain or cassette cogs because it is depends greatly on riding conditions and maintenance technique.
Limiting chain stretch to 1/16" per foot is the generally accepted maximum. If the chain is not streched this much, then technically it still has life in it, but I would never use any chain for 7000 miles. Are you sure you're measuring the chain correctly? A 12 inch machinist's scale works great. Lay left end of the scale on the edge of a pin, (with the pin visible) and the chain stretched tight. The right end of the scale will completely cover the pin at that end when the chain is new. As the chain becomes longer, the pin on the right hand side will begin to peak out from the end of the scale. When it gets to 1/2 the diameter of the pin, the chain's about shot. My campy chains show only a fraction of this amount of wear after 4000 miles, but I change them anyway. I think that shifting precision begins to suffer due to side wear, if the chain is used too long.
If the cogs that are skipping are the Ti cogs, it's not surprising. Ti cogs don't last as long as steel. I won't buy another Record cassette for that reason. I'd stick with an all steel chorus cassette.
I tried a wipperman 10 speed chain on my Record equipped bike and found it to be noisy. I much prefer a campy chain, but use a wipperman connex link if I want to be able to remove the chain.
Dec 9, 2003 5:56 PM
|I consistently get 10K miles out of Record 9 chains with Chorus steel cassettes. They're just at the 1/16" elongation point, and I replace both. Works out to $70 for 10K miles, or about 0.7 cents per mile. Cheaper, IMO, than replacing chains every 1500 miles in hopes that your cassette will last longer. However, this mileage depends on your gear selection (faster wear when using the small ring and smaller cogs), your maintenance, how often you get caught in the rain, and how dusty your local conditions are. All are indeterminant in their impact, so it's very hard to predict YOUR mileage.|
|What about chainrings ?||Steve Young|
Dec 10, 2003 8:53 AM
|I'm curious as to how often (relatively) you need to replace chainrings under this (or any other) replacement regime.
Do you replace rings at the same time, every other chain replacement etc?
I was thinking that the wear on the chainring(s) would perhaps be equally rapid as there are only 2 or three of them. However is this irrelevant given the larger diameter (relatively fewer rotations), more teeth consequently distributing loading across a larger contact surface??
I'm not clear about the force distribution though - at any one point in time I'm guess the load is on just a few teeth.
|Probably wear faster, but not very fast||Kerry Irons|
Dec 10, 2003 5:56 PM
|My current Campy Record rings have about 55K miles on them, so that means they've seen 6 changes of the chain/cassette. I've only had to replace rings once, at about 60K miles for a 1972 Campy NR set. I was running smaller rings and the alloys were not as good. Reading this board, it seems that VERY few people keep anything long enough to ever wear out good quality chain rings.|
|re: Chain/cassette compatibility||Chen2|
Dec 10, 2003 7:35 AM
|Have you tried adjusting the cable tension? When the skipping occurs, does the chain stay on the same cog or does it try to shift to a different cog? Might try the easy fix first, www.parktools.com for instructions if you don't know the drill.|
|re: Chain/cassette compatibility||rwsh|
Dec 10, 2003 2:40 PM
|The "skip" is longitudinal (in the direction of chain drive" rather than transverse ..... in other words, no gear change occurs but when powering up a hill a forward skip of one link can be quite disconcerting !!!!|
|re: Chain/cassette compatibility||Al1943|
Dec 10, 2003 8:28 PM
|That could still be a tension adjustment problem if the chain starts to shift but then falls back on the same cog. I've had this happen when my cables and housings were starting to get old and there was too much friction on the cable. Or when a new cable had stretched.|| |