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DA DOWNTUBE SHIFTER PROBLEM, CANT PUT BACK TOGETHER......(8 posts)
|DA DOWNTUBE SHIFTER PROBLEM, CANT PUT BACK TOGETHER......||surf|
Mar 4, 2002 11:32 AM
|I was installing a new rear derailer cable and housing and after some adjustments i just could not get the thing to shift perfectly. So .... I decided to take apart the Dountube shifter and clean it etc. Well the damn thing wont go back together!!! I looks like it is worn out and has one broken tooth so I might as well replace it. Any comments would be appreciated. |
Since im busy now I figured to just drop the bike off at the local Performance Bike shop. Do the mechanics generally know the workings of these older systems? Any suggestions or tips for replacements? Thanks for the help
By the way, its a 7 speed system on an older bike so thats why i would rather just replace the downtube shifter than upgrade the components to 9 speed sti. But i have heard that there is a 7 speed sora STI system for about 110.00. I have heard so many times though that Sora is crap, what do you guys think?
|re: DA DOWNTUBE SHIFTER PROBLEM, CANT PUT BACK TOGETHER......||Dave Hickey|
Mar 4, 2002 12:15 PM
|If your rear derailleur is Dura Ace, Sora won't work. Pre-nine speed, only Dura Ace shifters work with Dura Ace derailleurs. If you need to replace the shifters, go to ebay, They regularly have 6,7,and 8 speed Dura Ace downtube shifters for about $25.00.|
|Try this to fix them||Dave Hickey|
Mar 4, 2002 12:36 PM
|Go to this link: http://www.shimano-europe.com/cycling/index.phtml
Enter in part no SL-7700. That is the dura ace part number for the 9 speed downtube shifters. Click on "download exploded view". That will bring up a drawing of the shifters. Chances are you didn't re-install parts no 4 and 5 correctly. The parts are called stopper washer and spacer. I know this is for the nine speed downtubes, but the parts are the same on 7 speed. The shifters will not work correctly without these parts.
|Thanks Dave, that view helps but..||surf|
Mar 4, 2002 12:53 PM
|Part 2, the SIS unit has one of those teeth broken off, should it still work. Also, i put in all this parts shown and but the SIS unit wont fit tightly especially when I try to add tension via the D-ring. The thing click and shifts gears bit the shift lever is sooo loose you can tell something is wrong. |
But -- thanks for the tips, this is a big help. Maybe i just need to try one last time
|Actually, tell me what you think about this, does the SIS part..||surf|
Mar 4, 2002 1:07 PM
|Maybe the SIS unit (part 2) has a special orientation? I remember looking at the teeth on it and I noticed that some were larger than others. I did spin it around a bit but it doesn't seem to want to fit in tight. Just another comment to myself but if anybody can comment on this please do so. |
|Actually, tell me what you think about this, does the SIS part..||Dave Hickey|
Mar 6, 2002 4:31 AM
|Sorry, I've been out of town a couple of days. The SIS unit does have a special orientation. The washer with the little tab has to be put on correctly or you'll have the problem you've described. I'm speaking from personal experience. I've had the same problems you've had.|
|this could be it but i would check with them first....||Spirito di Finocchio|
Mar 4, 2002 12:58 PM
|as already posted i would definately make sure you have the sequence of assembly correct but if indeed 'coz it is worn or broken then i think the following is an option for you... they dont have much in the ways of specs so check with them
|you won't like cheap STI||BenR|
Mar 4, 2002 12:19 PM
|Advice? Take a step back, swear at it a little more, and try again. If that doesn't work, try the shop. If the shifters can possibly be fixed, your local shop will take care of you. If not, stay with downtubes especially if you are used to them, don't race anymore, and don't want to spend big bucks. You may have to spend some time looking around for a pair. Sora is no good. STI in general is more expensive, heavier, and does not shift as crisply as downtubes due to the extra cable length and fussy mechanisms. I actually went back to 8 speed downtubes after my 1995-6 RX100 STI's wore out this year. Shifting is much better compared to when the STI's were new. It seems that my old STI's lasted longer than the current models have (according to my buddies).
If you decide to go with STI, do it right and upgrade the bike to Dura Ace 9 speed or virtually any Campy groupo Veloce and above. I would shy away from Ultegra/105 due to lack of longetivity with the shifters-perhaps they have fixed that this year? I'm sure someone knows.