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Shifting Problem(8 posts)

Shifting Problemtyrius
Jan 23, 2003 12:09 PM
Sorry for the simple question, but I'm having problems shifting down through the cassette. What happens is the STI shifter just doesn't seem to "catch" and move the cable move the derailleur. Shifting up the cassette is fine and after I ride for a while and get the bike warmed up (I'm in Chicago where it is like neg degrees) it seems to shift better, but not perfectly.

Any hints on how to fix this?
re: Shifting Problemjimmy320
Jan 23, 2003 12:29 PM
What you likely have is a cable related problem...when shifting to a larger rear cog, the cable is "pulled" which tightens the cable, resulting in a nice shift, but when shifting to smaller cog, the cable is loosened or released of a bit of tension which isn't as positive--a bit of a bind between the cable and its housing at any point along its travel can impede the cables' movement and delay or prevent the desired shift from taking place. Typically worse in cold weather due to possible thickening of lubes, frost formation, season long buildup of dust in combination with lube, etc--can also be stiff rear der for same reasons but more likely cable....clean and lube cables sparingly with a light lube, replace cable if rusty--you may have to pull it out of its housing to check for this, check under the BB shell for a source of binding--somewhere along your cable route I'll bet you'll find a cure.

Good Luck

(part-time wrench) Jimmy
Sounds like a job for Barrel Adjuster...cory
Jan 23, 2003 12:32 PM
I'm assuming that by "shift down," you mean to a LOWER gear, but UP the cassette, from small cog to larger (don't mean to preach, but a lot of people get that wrong). Look for the barrel adjuster (little knurled thing the cable goes through) and unscrew it a turn. If it gets better, you can fine-tune it until it shifts properly
No, meant from say the 15 tooth to the 14 tooth. (down)tyrius
Jan 23, 2003 12:46 PM
Sorry I wasn't clear enough.
No, meant from say the 15 tooth to the 14 tooth. (down)MR_GRUMPY
Jan 23, 2003 1:47 PM
Is it all gears, or is it only from the 15 to the 14. ???
Try to hold the front lever when you shift the inner one. If it works now, you might have a busted lever.
Is it still covered ?????
It's all of them. It works sparodically.tyrius
Jan 23, 2003 2:20 PM
Almost perfectly when warm. Not well at all when cold (bike is in garage).

Thanks for the help and I'm hoping it isn't a busted lever.
re: Shifting Problemrogue_CT1
Jan 23, 2003 4:21 PM
My Campy Record did the same thing when the temps dipped intot he teens last week. I just turned the barrel adjuster 1/2 turn clockwise and that solved the problem.
re: Shifting Problemedmundtan
Jan 23, 2003 6:00 PM
It's probably caused by the cable contracting when the weather turns cold. That will throw the adjustments off. Compensating by turning the barrel adjuster clockwise solves the problem, but do check again when the temperature rises in the day.