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STI Shifter upshift issue - Can it be diagnosed over the internet?!

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STI Shifter upshift issue - Can it be diagnosed over the internet?!

Old 12-10-12, 08:51 PM
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umcade
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STI Shifter upshift issue - Can it be diagnosed over the internet?!

Hello,

So recently I noticed I am having a strange issue with my right 105 Shifter (2011 model). The shifter *should* be able to upshift 3 cogs in a single brake lever swing. I notice that intermittently the 3rd index point does not "click", resulting in my derailleur falling back to the 2nd index point of the shifter swing.

This is irritating because a) I should be able to upshift 3 cogs, and b) as it occurs intermittently, I will accidentally swing past the second index point, my derailleur will move my chain up a cog, but then fall back down a cog when it fails to click at the 3rd index point. As you can imagine this up-down shifting messes with my cadence quite a bit and is jarring. It has severely shaken me in a race.

Anyone experience this? I theorize one of the pawls must be wearing or something, but I only have a cumulative 3000k on the bike, so I hope shimano stuff would last longer than that.

Thanks for your time!
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Old 12-10-12, 09:19 PM
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Sounds like a sticky pawl: flush with wd40 (to break up the factory grease) then lightly lube with whatever your heart desires.

As an [somewhat] aside, how do you store the bike? I'm noticing that the brifter bikes of mine I hang from a rear wheel seem to have semi gummed up shifters when I take them down to ride. Also, the factory grease doesn't take all that kindly to the cold.
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Old 12-10-12, 09:45 PM
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Thanks for the reply, I store the bike upright leaned against the wall of my bedroom, or sometimes in my bed if the girlfriend isn't looking (Who do I love more? I'll never tell!)

What type of lubrication am I looking for? I have purple extreme and Phil Wood grease laying around. I'm a little unfamiliar with the functionality of STI shifters - its just a magic shifting machine! - which part should I lube? Just everything visible with the hoods removed? Do I have to open up the plastic body at all?
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Old 12-10-12, 10:38 PM
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If the first reply is a correct call the the lube you're looking for is a light and penetrating kind. Maybe followed up with a med weight one. The common problem with Shimano shift pods is that the lube that the ratchets use gets old, thick and then sticky. So one needs to solvent off the old lube and get freash and slippery stuff in there. Since the pivots are not easily accessable a light and thin lube aidded with air pressure is a good method to drive the lube int the nooks and crannies. With working the shift pod back and forth then redoing the lube application/blowing through in time the old stick stuff is melted away and replaced with the new. Andy.
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Old 12-10-12, 11:09 PM
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Originally Posted by umcade View Post
Thanks for the reply, I store the bike upright leaned against the wall of my bedroom, or sometimes in my bed if the girlfriend isn't looking (Who do I love more? I'll never tell!)

What type of lubrication am I looking for? I have purple extreme and Phil Wood grease laying around. I'm a little unfamiliar with the functionality of STI shifters - its just a magic shifting machine! - which part should I lube? Just everything visible with the hoods removed? Do I have to open up the plastic body at all?
You'll never get grease of any sort in there without delicate surgery. It's far better to use cans of spray oil to hose out the internals as above. WD-40 works, but I prefer very light petroleum-based lubes that are usually available in better hardware stores.
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Old 12-12-12, 01:42 PM
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Careful of the rubber...

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Old 12-12-12, 03:53 PM
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All you need to do is shoot the shifter full of WD40. Use the red straw that comes with the can. Peel the rubber back in as many places as possible and shoot it in. You can add a light oil if you want to but if you ride in dusty conditions the dust will stick to the oil and may cause more harm than good.
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Old 12-12-12, 07:35 PM
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What? NO!

You don't even need to peel the hood back, open up the quick release on the brake or take the wheel out and pull the lever in towards the bar like you're braking. Squirt in the hole where you load the cable, squirt in the cracks, but try and stay away from the rubber hood.
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