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STI lever problem(10 posts)

STI lever problemfreespirit
Jun 10, 2001 3:26 PM
I reinstalled the 9 speed STI shifter levers after changing bars. Everything is the same, but now the rear (right) shifter won't work right. Moving the large lever will shift the chain to the left, but it immediately jumps back down, like there is no ratcheting going on. Any clues as to what's going on? Could it be the cable? I did replace it, but it looks the same as the former one. BTW, it's not been damaged, pulled apart, or anything.

My guess is:Spoke Wrench
Jun 10, 2001 4:15 PM
that when you replaced the shift cable you didn't get it into the STI lever correctly. That's a fairly common problem.
need more help, please - won't ratchetfreespirit
Jun 13, 2001 7:27 AM
I removed and replaced the cable with an "official" Shimano cable. I don't see any way to insert the cable wrong - you just pull the brake lever in and run the cable through the horizontal hole, right?

I just seems like the darn thing won't ratchet - won't catch as it moves up a gear. It just slips back down. Could it be something internal?

BTW, I did check to click the downshifter all the way down before installing the cable, so it was in the first position (small cog).

Please, any more ideas? These things are too darn expensive to just replace. Thanks.
need more help, please - won't ratchetgrz mnky
Jun 13, 2001 10:54 AM
Well, yes it's fairly straight forward to get the cable back into the shifter, but it's even easier to do it incorrectly. Since you haven't done anything extreme like crash or take it apart the problem should be limited to what you did/didn't do. To reitterate what you need to do is remove the cable completely. Shift all the way into the smallest cog. Squeeze the brake lever to view the insertion port and verify that you can see the guts of where the cable goes. You should be looking at a cylindrical hole that the cable end rests in. You may need a flashlight to see it. Shift up and down through the gears without any cable. Verify that you are using the correct cable end - many times shift cables can come with two ends - only one of which will work for you. Insert the cable and verify that the cable stop fully inserts into it's hole. Hold the end of the cable where it comes out of the shifter without the housing. While applying light tension shift up and down through the gears. Once you have the shifter working correctly you can put it back in the housing and reassemble.
maybe I'm a moron... can't get it to workfreespirit
Jun 14, 2001 7:49 AM
Thanks for the help.

The shifter has not been so much as bumped, nor taken apart, or anything. It's been on and off several times, and always has worked perfectly.

I shifted down (small lever) completely, then pulled the lever in and threaded the cable from out to in through the hole in the cylinder, coming out the right place to meet up with the cable housing. I have the official Shimano cable, so shouldn't be an issue.

After threading through the entire cable, with the end resting just inside the cylinder, I put tension on the bare cable where it exits. Same thing. While shifting the large (front) shift lever, the cable pulls, but then won't grab or ratchet. It just returns to the first position every time.

I've done this procedure many times before, with no problems. It almost seems that the shifter must have a problem, unless there is some quirk about threading this thing that I've just not figured out this time. I don't get it.

Please, any more ideas? Thanks.
I don't think so....grz mnky
Jun 14, 2001 11:00 AM
I wouldn't say you're a moron. Things on a bike can sometimes be very tricky and at other times be insanely simple. It really comes down to being patient, curious, tenacious, and not giving up until you understand it. In all honesty the STI mechanism is right up there with Swiss watches on the mechanical complexity scale. There could literally be a dozen things wrong, but I try to start with the simplest explanation even though my mind wants to immediately jump to the most complex.
I don't think so....What?Jamm
Jun 14, 2001 1:26 PM
"STI mechanism is right up there with Swiss watches on the mechanical complexity scale"----grz monky, you are absolutely an idiot if you believe that.
Ok, any help?freespirit
Jun 14, 2001 2:11 PM
if you are indeed familiar with them, then please help. I'm begging.
ever notice?peloton
Jun 14, 2001 10:44 PM
That people who slam grz's mechanical knowledge or posts rarely, if ever, contribute anything of substance? If you don't have the answer, don't slam someone's else's attempt to help.

It's easy to tear down, it's hard to build up.
Oh Really?grz mnky
Jun 15, 2001 11:26 AM
First, I didn't make that sound bite up, another poster here did. Still, I do believe it having worked on both. Maybe you've got a nice and simple detailed set of instructions to share with us.

The Challenge:

I defy you to *completely* disassemble an STI mechanism down to the last spring and then reassemble it in an 8 hour day, on your first try, and have it work correctly. Go ahead try it.

Anyone who has been there knows exactly what I'm talking about. Realize that there are no instructions, no exploaded views of the tiny guts, no spare parts if your break or lose something, a special tool is mandatory, and it only goes together exactly one way. BTW - a Campy shifter is child's play in comparison.

Also, I asked my momma and she said I wasn't an idiot and not to take it personally.