|Newbie Q: Is this frequent retuning necessary?||Damocles|
Feb 17, 2002 9:55 PM
|I'm riding a 2000 LeMond Reno with Shimano RSX components, bought ex-display Dec last year. However, when I took it to my LBS to get a tube change (only because it was free as part of the sales package) they looked at the gears as well. Unfortunately I was out when they called to ask if they could work on them, and my mother told them to go ahead. After 200km (or 8hrs, whichever way you want to count it) the rear derailleur started to skip every 4 pedal revs, and shift rear cogs. Not trusting my own skills, I took it to a more reputable LBS to get a retune. But after another 200k, the same problem has come up again. I know I'm guilty of a bit of cross chaining, but very occasionally. . . so is the problem me, the bike, or the LBSs? I'd be grateful for any input.|
|re: Newbie Q: Is this frequent retuning necessary?||uhhuh|
Feb 17, 2002 11:19 PM
|it just sounds like cable tension.. its an easy fix.. and you can do it yourself...|
|re: Newbie Q: Is this frequent retuning necessary?||xxl|
Feb 18, 2002 1:37 AM
|The other dude is probably right; it sounds exactly like derailleur cable stretch, which is normal, and an easy fix. Any bike manual (e.g. Barnett's) can tell you, or check the Park Tools website. BTW, your brake cables will also stretch a bit, and you can adjust these similarly.
The problem is not you (cross-chaining is not good, but you'd have to do it a lot to cause enough metal wear to make the chain skip like it is). If your LBS charged you for the gear adjustment, it should've been a pittance; otherwise, find a new shop. I mean, you bought this in December 2001, right, and it's only February? This should be just the sort of service that a LBS should toss in to help keep your business, IMHO.
One other possibility is your chain. You might just check it to make sure that there aren't any "stiff" links in it, especially if you (or the shop) has had occasion to crack it recently (maybe you've cleaned it?) But, what you described sounds exactly like good old-fashioned cable stretch.
|I'm betting you have a tight chain link.||Spoke Wrench|
Feb 18, 2002 6:56 AM
|The key is that you say it auto-shifts every fourth pedal stroke. That's exactly the right frequency for a tight chain link.
Pedal your bike backward with your hand while you examine the chain as it comes off of the lower derailleur pulley. If you find a link that stays "kinked'" try working it side to side with your fingers or use a chain tool to spread the side plates a bit.
If you have a Shimano chain, another possibility is that the pin used to join the chain may be sticking out a bit. If that's the case, file the sticking out bit flush and you're good to go.
|Good call wrench||Eric16|
Feb 18, 2002 10:43 AM
|Yeah, although the cables will stretch as you're breaking them in, this sounds like a stiff link. Once you find the link drown it in lube and work it from side to side until it loosens up. Or, if you're not a do-it-yourselfer, go back to the shop you bought it from, tell them you think you have a stiff link and have them work the d*mn thing out!
Quick note on the cable tension too, if new cables start shifting poorly or braking loosly it almost always means they've stretched a little, so just but some more tenion on them. This is something you'll want to learn to do yourself, as being able to do minor braking/shifting adjustments is a good skill to have. Good luck and ride on