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older STI shifter help(7 posts)

older STI shifter helphaeffnkr
Apr 19, 2003 6:19 AM
I am very handy but have not ever tackled any shifter mechanics on my recently purchased used Miyata bike.
It has the older style black STI shifter, with 2 levers, one pulls the cable and one clicks down.
The middle and low gear shifting is fine.

I need to replace or repair my older STI front shifter, for the front sprokets.
Mine currently will not pull the cable into high gear.
I pulled the assembly out and sprayed it with WD40 and cleaned it up, no help.
It appears on the second push into high gear, a cog should be enagaging with the gear assembly to pull the cable another notch but it doen't, it just slips and I do not know what is stopping it.

I need the parts to fix this or the assembly to replace this thing.
Any help would be appreciated.

Thanks Kevin
cable tension?Dave Hickey
Apr 19, 2003 6:28 AM
Are you sure the cable is not too tight? On the fronts, If the cable is too tight, your missing the first click.
Apr 19, 2003 7:04 AM
Dave is right, the cable needs to be fairly loose when the front derailleur is in the fully retracted position. If the cable is too tight, the shifter will not reach the high gear stop.

Of course, this may not be your problem but double check to make sure. If it still doesn't work, good luck. Opening up a STI lever is something I've never tried - nor do I want to.

Apr 19, 2003 7:23 AM
no the cable is not overly tight, but I will double check it.
If this is not the problem what are my options/replacements/etc.

thanks Kevin
YesRusty Coggs
Apr 19, 2003 8:09 AM
If the internals are broke or wore out,It's likely replacement time.There may be a couple minor replacement parts listed in the QBP but not for the internal ratchet mechanism.7 speed RSX is no longer available as new,but they often show up on ebay. An 8 speed rsx, rx-100 or 105 that is a TRIPLE specific front is a close replacement.
Woops....Rusty Coggs
Apr 19, 2003 8:15 AM
...cancell the part starting with 7 speed something that was not there.Too much crack this morning.
re: older STI shifter helpboyd2
Apr 22, 2003 4:19 AM
I repaired my older 105 STI by:

1. Find the tech manual on-line. I can fax you a few pages if you need it.
2. Take the shifter housing off of the bike and remove covers. Do not disassemble inner mechanism. You will be sorry if you do.
3. Clean with a good degreaser. I used White Lightening "Clean Streak" aerosol and it was perfect. Find a can of this stuff it is great. Note that WD40 can be used to clean, but it will not break down and clean that sticky old grease that could be causing your problem.
4. Lube it up. I used tri-flo.
5. Put back on bike.

If the old stiff grease is your problem this will cure it. That was my problem and the shifters work great now.

I assume you checked to make sure that your limit screws were not the problem?