Is there a problem or do you just have an itch?Originally posted by xc_gumby
Anybody got any ideas about how to clean & lube the mechanism?
I've got some service diagrams from Shimano but it really doesn't look obvious.
I've got 1999 105s.....
Best not to mess with them till there is a specific problem.Originally posted by xc_gumby
oh, I've just got an itch!
I'm just curious about how fanatical people are about maintenance.
I wouldn't unless there is a specific problem traceable to the shifters. They come packed with proper grease. Over time, and depending on conditions, they can get crudded up or the grease stiff. They can also go years without needing attention.It's possible to hose them out with a suitable solvent, and relube with a suitable spray. Trying to take them apart gets ugly.Originally posted by froque
Hi,
I would like also to service my STI, Is there any way to clean and lubricate them without taking them out of the handlebar?
BR
froque
I might like to find that guy. I have a Dura Ace STI lever that is misbehaving and I'm considering the disassembly route. Symptom: right lever will usually not shift from larger to smaller cog using the small inner lever unless I hold the larger outer lever still. Shifting from smaller to larger cog works fine. The outer and inner levers seem to move together when I try to shift larger to smaller using the inner lever and nothing happens. I have tried cleaning thoroughly with a spray degreaser followed by lube with tri-flow spray. It didn't make a difference. Any thoughts?xc_gumby said:Cool, though recently I found a guy who DOES rebuild the shimano levers. He trained originally as a watch maker (horologist actually...)
Look for a loose or missing screw on the upper backside of the levers that holds them together. You don't have to take anything apat to look.65cmFixie said:I might like to find that guy. I have a Dura Ace STI lever that is misbehaving and I'm considering the disassembly route. Symptom: right lever will usually not shift from larger to smaller cog using the small inner lever unless I hold the larger outer lever still. Shifting from smaller to larger cog works fine. The outer and inner levers seem to move together when I try to shift larger to smaller using the inner lever and nothing happens. I have tried cleaning thoroughly with a spray degreaser followed by lube with tri-flow spray. It didn't make a difference. Any thoughts?
Thanks for the input. I see a screw on the upper back of the larger outside lever. The screw is not missing and doesn't seem to be loose. Could something be gummed up in the works here?boudreaux said:Look for a loose or missing screw on the upper backside of the levers that holds them together. You don't have to take anything apat to look.
The levers are connected to a cog with a ratchet mechanism on both sides, which permits the cog to move in one direction only depending on the lever you move. Moving a lever (the outer one for example) disengages the forward pawl to move to the next slot. The reverse pawl slides along the opposite slots, still engaged. Moving the opposite lever does the reverse.65cmFixie said:I might like to find that guy. I have a Dura Ace STI lever that is misbehaving and I'm considering the disassembly route. Symptom: right lever will usually not shift from larger to smaller cog using the small inner lever unless I hold the larger outer lever still. Shifting from smaller to larger cog works fine. The outer and inner levers seem to move together when I try to shift larger to smaller using the inner lever and nothing happens. I have tried cleaning thoroughly with a spray degreaser followed by lube with tri-flow spray. It didn't make a difference. Any thoughts?
xc_gumby said:Anybody got any ideas about how to clean & lube the mechanism?
I've got some service diagrams from Shimano but it really doesn't look obvious.
I've got 1999 105s.....
jp111 said:I got sand in my Ultegra levers, and took them apart to clean them out, they never recovered, had to buy new ones. Very tedious undertaking. Also, had problems with my old 105's after oiling them. My LBS said to leave them alone.
If its the same as Ultegra, which it most likely is, then the screw is essential for correct shifting. Without it the Ultegra's have very imprecise shifting.drebro said:The screw in the back of my 105 lever (the right one) fell out the other day on a ride. Does that screw do anything? All I notice is that the whole mechanism rattles a little more without the screw.
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