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Is my left STI (Shimano 6510) toast or still repairable?!?!(7 posts)

Is my left STI (Shimano 6510) toast or still repairable?!?!wasabekid
Dec 22, 2002 7:50 PM
After hilly/roller ride yesterday my left STI triple downshifts from 52t to 30t bypassing the 42t. Upshifting/trimming is no problem. Clicking the downshift lever when at 52t requires a little more persuasion than normal, then BAAMM, it jumps down to 30t, nearly losing control of the bike. Cables' tight, no slack can be taken up on the adjuster, front der is good and tight. Tried oiling the shifter, no change.

Anybody have(had) same problem? What remedy(ies) did you try?

TIA
I ride and like Shimano too but it's toast. nmJuanmoretime
Dec 23, 2002 1:51 AM
re: Is my left STI (Shimano 6510) toast or still repairable?!?!BrokenSpoke
Dec 23, 2002 11:32 AM
Had a similiar problem with my Ultegra STI shifter. It took a lot of pressure to the downshift tab to shift, but it would shift. Spoke with a local mechanic who recommended using a lot of WD-40 to basically flush out the dirt that had accumulated. Make a long story short, used almost the entire can, flushed out a ton of gunk, and the shifter works fine. Give it a try.
re: Is my left STI (Shimano 6510) toast or still repairable?!?!wasabekid
Dec 23, 2002 3:48 PM
I have lubed the heck out of it to no effect. Purging it with WD-40 might be a good idea, I'll get me a can tonight. You did not mention if yours was skipping 'tho?

The other thing that bothers me is that it's only got ~1200mi.

TIA
re: Is my left STI (Shimano 6510) toast or still repairable?!?!BrokenSpoke
Dec 24, 2002 6:32 AM
Well my crankset was only a double so it wasn't skipping the middle ring like yours is. What it was skipping was the middle detent stops that allow you to trim the chain. As far as 1200 miles goes, you could clog them up in 200 if you wanted to. Depend how where you ride, how much rain, road gunk, mud, etc. When I lived in California I never had a problem. When I lived in Seattle, the shifter clogged after about 6 weeks of riding in the rain almost every day. Since that first time, I made the WD-40 flush part of my monthly maintanence on the bike. Haven't had a problem since.
re: Is my left STI (Shimano 6510) toast or still repairable?!?!wasabekid
Dec 24, 2002 2:10 PM
Tried flushing it with almost the whole can, it did not make any difference.

Incidentally, the bike have never been ridden when raining but after a rain maybe a couple of times.

Any other ideas? I know it's still under warranty, I'm just trying to save myself a trip to the LBS and be told nothing's wrong with it "by doing this or that".

TIA
re: Is my left STI (Shimano 6510) toast or still repairable?!?!BrokenSpoke
Dec 25, 2002 12:17 PM
I am out of ideas, sorry. If it's still under warranty I wouldn't mess with it anymoe and take it back.