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Dura Ace rear shifter won't downshift!(8 posts)

Dura Ace rear shifter won't downshift!PT
Jun 28, 2003 2:07 PM
In today's race I got to the top of the climb and couldn't downshift! I had to ride the 30 miles back in either the 53-21 or 39-21 -- with the descent and tailwind I was hopelessly outclassed. I've never experienced this before. After the race, someone told me it was something that happened with Dura Ace and I was SOL -- basically needed a new lever. It was bizarre -- just came on over the course of the race and failed me at a critical time. It turns out you can get it to shift by holding the outer/big lever while pushing in on the inner lever -- not quite impossible to do while riding the bike, but hardly ideal.

So my question is -- does anyone know about this issue? Is there something that can be done to fix it? Does Shimano "warranty" this problem? Finally, if it does really need to be replaced, where can I get the rear/right lever at the best price?

Thanks for any help.

First blow out the shifter with WD40...TFerguson
Jun 28, 2003 2:14 PM
Upshift all the way to the small cog. Blow WD40 in the hole where you would thread in the cable. Continue applying and working the shifter untill it starts coming out clear.
Jun 28, 2003 4:28 PM
If it's less than 3 yrs old it should be under warranty, Shimano's pretty good about it and it usually comes back within a week. Take it to your LBS or wherever you got them and they should come back with no charge, besides Shipping and Handling from your LBS.
Ditto, warrantyMR_GRUMPY
Jun 28, 2003 5:00 PM
Don't flush it out, unless it's out of warranty.
Shimano might not like it.
mine did this... exact same way too!YoungRcR
Jun 28, 2003 6:33 PM
top of a climb in a race... couldn't downshift. LBS said it was common, some screw falls out or somethin breaks, anyway they cant fix it so they warranty it :-)
Then re-lube it with oilKerry Irons
Jun 29, 2003 5:19 PM
If you just flush with solvent (like WD-40) then you run the risk of a lube-free shifter. If the solvent flush makes it work again (worth a shot) then follow it up with some actual lube - TriFlow, ProLink, etc. The oil will mix with the grease in the shifters and you'll be fine until you can pack some more grease in there. If the solvent flush doesn't fix it, you need new shifters.
This is the most common failureUncle Tim
Jun 29, 2003 7:54 AM
When the Shimano shifter goes bad, this is the most common form of failure. You push the small lever to get it to release the cable and nothing happens. Of course, the shifter will continue to take up cable in the ratchet mechanism, so in the course of fooling with it, the chain ends up stuck on the largest rear cog.

I've experienced these failures, but usually after a high number of miles. The lowest mileage figure was 7,000.
Article on TFerguson's suggestion...coonass
Jun 29, 2003 4:57 PM