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Help(11 posts)

Helpmackgoo
Jun 21, 2001 10:45 AM
I just picked up a used bike with Shimano Dura Ace. For the life of me I can't get the rear to work the way I think it should. If I get it to shift smoothly up from smaller to larger cog, it hangs more than on occasion going to the smaller cogs from the larger. If I get it so that it shifts going down then it starts hanging going up.
Is there a "fool" proof procedure to set these up?

Thanks
re: HelpHank
Jun 21, 2001 1:25 PM
lube or possibly even replace the cables and housing. If that doesn't work, check the rear hanger alignment.
re: HelpLen J
Jun 21, 2001 2:02 PM
Go to www.parktool.com/workshop and read up on Rear Der Limit screw setting and Checking the Rear indexing Adjustment. Follow thier instructions, they are straightforward. If you still have a problem, it may be in Chain Line or Frame. Good Luck.
re: Helpmackgoo
Jun 26, 2001 5:45 PM
Thanks for the tip. I'll still be going Record this winter but the summer will be bearable now.
Cable housing.J.S.
Jun 21, 2001 2:15 PM
Lube all cable housing and check for fraid ends. Particulary check the final housing that goes into the derailleur, this piece can become kinked or just cause friction from lack of lube that can create the shifting problem you mention.
Chain/cassetteKerry Irons
Jun 21, 2001 6:03 PM
In addition to the good advice on lubing the cables, you might check the chain for excessive wear. Greater than 1/16" elongation in 24 links (12" original chain length) means it's probably time for a new chain, and that probably means new cassette cogs as well. Also think about lubing the derailleur pivots. Finally, squirting some lube into the brake/shift levers certainly won't hurt.
"squirting some lube into the brake/shift levers certainly won'tbill
Jun 22, 2001 8:57 AM
hurt." This is my question on the components board. I've got Ergo shifters, and was experiencing some jamming going from smaller to larger cogs. I checked the hoods, because, as someone else here noted some time ago, the little tabs have to be oriented just so or they can interfere. Didn't help. I finally just squirted some dry-lube in there, which has worked, but now I'm worried that I've lubed what should be greased or somehow introduced the gook that will kill my shifters.
"squirting some lube into the brake/shift levers certainly won'tgrz mnky
Jun 22, 2001 4:27 PM
Well, it can do the trick, but you do risk attracting more dirt and mung. Sometimes it's the right thing to do, but I try to do it last. Blasting WD-40 loosens things up but tends to be a solvent and disolve other forms of lube. Spray-on TriFlow is a nicer lube, but also a huge dirt magnet. Tearing down and rebuilding a Campy Ergo lever is significantly easier than Shimano STI.

A more likely scenario is that your housings are full of gunk and creating lots of drag. This is kind of a bummer with Campy Ergo b/c you have to re-wrap you bars to replce the shifter housings - new cable alone is usually just a partial solution. Still, it's not the end of the world.
One more thing to checkcory
Jun 22, 2001 10:02 AM
One thing I often forget is to put a drop or two of lube on the cable where it goes under the bottom bracket. I hate to do it because it seems like it would hold dirt and make an abrasive paste, but it often cleans up the shifting when everything else has failed.
re: HelpKEN2
Jun 22, 2001 10:52 AM
You don't mention how old the derailleur might be, but another possibility is excessive wear in the derailleur pivots. If it develops too much slop it shifts just the way you're describing. Grab ahold of the cage and see how much play there is side-to-side. There should be a little, maybe 1/16", but not much.
Could be this..muncher
Jun 22, 2001 11:00 AM
Make sure that the chain and the drive are compatible and the same series - e.g. HG/IG. That can cause this prob too.