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My shimano STI rear shifter is jammed and won't shift.(6 posts)

My shimano STI rear shifter is jammed and won't shift.Herms
Jul 31, 2002 4:36 AM
My shimano 105 STI rear shifter wont shift. they will pull back so that you can brake but the brake lever and the other little lever aren't even able to be pushed to the side to shift. I have unconnected the derailleur cable and that hasn't helped. Any suggestions are appreciated as I can't ride my bike if I can't shift.

Thanks, herms
re: My shimano STI rear shifter is jammed and won't shift.Chen2
Jul 31, 2002 5:37 AM
Is the cable jammed or is the shifter jammed? Comepletely remove the cable by pulling it back through the shifter. If that clears the jam, then you need new cables and cable housings. If the shifter still doesn't work you could try shooting the inside with WD 40 and flushing it with compressed air. Or you may need new shifters. How old are the cables? Shifters? Also check the routing of the cables under the bottom bracket. Do not attempt to disassemble the shifters.
re: My shimano STI rear shifter is jammed and won't shift.Herms
Jul 31, 2002 9:46 AM
the shifters and the cables and housing are like 2 months old. And the cable is not caught on anything. I think I'm gonna end up sending it back to shimano
Jul 31, 2002 11:10 AM
Did you work on it yourself first or were you "just riding along"?

If you don't do the cable repalcement correctly you'll have problems. If you lubricate the cables with the wrong stuff they'll attract gunk and jamb up good. If you wreck or otherwise abuse the shifters you can damage the mechanism. If you lose the little screw on the back of the small lever things can get ugly. If the cable slips on the deraileur things won't work right. There's no telling what kind of trouble you can get into if you try to "fix" things on your own. They're a very complex mechanism and while they're pretty robust it's not impossible from them to crap out on their own. Taking them apart is not for the faint of heart. Probably the best thing to do would be to swing by the LBS where you bought the bike (you didn't go mail order did you?) and have them take a look at it. Chances are rather high that it's something quite simple. I've been riding, crashing and working on STI shifters for quite a few years and they're fairly relaible mechanisms - especially when new.
Jul 31, 2002 3:29 PM
They're about 3 months old and it happened while i was just riding along and i shifted gears once and they jammed up. I talked to Shimano today and they tried to help me out over the phone but it didn't help so I'm just gonna send them to shimano to be warranted.

Thanks for the suggestions though, Herms
Jul 31, 2002 7:29 PM
Jammed up STI shifters could also mean "the plastic piece" inside this shifter has failed. You can not replace this item. Your shifters are under warranty and send them back for new ones. Shimano is aware of this problem but hasn't announced a new design or fix yet. Many other riders including myself have experienced this frustrating problem.