Workshop tales, trials and disasters.
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10 posts • Page 1 of 1
Hi Guys, My bike is running 105 Brifters and derailers. Recently I've had to start multiple shift changes to get it to change up a gear. To explain it better. Sometimes when I want to shift up, I push the lever and nothing happens, no gear change occurs. If I press the lever again (Sometimes it will take 2-3 lever presses) it will change gear, when the gear change happens its a correct gear change, no skipping and correct cog selection. When the change doesn't occur the lever has no resistance, when the change occurs you can feel the resistance in the lever. It doesn't happen on any particular gear its just random, sometimes it changes sometimes it doesn't.
I was thinking of just replacing the shift cables, or do I have a bigger issue with my shifters ????
Great Jens Voigt Quotes:
"I get paid to hurt other people, how good is that?"
"Shut up legs"
If your cables are old I would start there but its common that the brifters gum up and need to be pulled apart and cleaned. There are a lot of posts in the sticky section on how to clean them big job though if you haven't done them before.
I wouldn't fiddle with the brifter internals unless you are especially mechanically talented.
The best fix I've read of is to just squirt large volumes of WD40 into the workings.
Hopefully this will flush out any gunk and re-lube the moving parts.
From memory there was a particular model of 105 shifter that had known and common issues.
ha ha yeah! the small parts can be pure mongrels to get back in. I once though I would try some liquid spray grease in there" Big Mistake", its stoped the rachet from working correctly. Silicon spray I have found to work for me and keeps every thing from gumming up and cleans any gunk out.
Very common for the older shifters (all types, road and MTB) to do that. The grease on the ratchety bits dries out & goes all cheesy, stopping the pawls from springing back into the next notch as quickly as they should. Do NOT try to pull them araprt, it will only end in tears! As others have mentioned, spray copious volumes of any sort of light lubricant in there & work the shifter back & forward until the guts start working again.
I had a thought, but it got run over as it crossed my mind.
Two theories. If you are contacting the rear paddle at all while you shift the brake lever, it doesn't engage. Are you now wearing full gloves since it is cold, you may be doing this. I had new DA shifters doing this and it took me a while to figure it out.
Secondly, if the shifters are sticky inside; I soaked a 20 year old 1991 tri-colour set in petrol for an hour, dried them out and lubed with spray on lithium grease. No more problems.
10 posts • Page 1 of 1
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