Red front shifter not working in the cold.

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Juanmoretime
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by Juanmoretime

My Red front shifter has been occasionally not catching the detent and I just figured out it has to do with the cold. This morning on my way back in on my morning ride the shifter would not stay in the big ring and no click. I keep my bikes in a heated room in my house. It still would not work after I returned. After the bike sat for a half hour in the heat I tried the shifter and it works.

Has anybody had this issue and better yet does anyone have a solution?
RESIDENT GRUMPY OLD MAN.

Scoops
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by Scoops

Wow, weird. Heated shifters?? OMG, a bit of a drastic solution!

mattr
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by mattr

How cold? Below freezing?
Might be condensation getting onto the working surfaces of the shifter when you take it out side, then freezing.
Bit of light spray oil to keep the water away?

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Juanmoretime
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by Juanmoretime

No not below freezing and 47°F.
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mattr
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by mattr

Possibly indicative of something that is on it's way out then. Difference between room temp and 8 degrees shouldn't be anywhere near enough to cause problems in a properly set up shifter.

Might just be worth a complete strip down and re-cable, just to see if it is set up properly.

rijndael
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by rijndael

mattr wrote:Might just be worth a complete strip down and re-cable, just to see if it is set up properly.
I agree. I wouldn't be surprised if you found a frayed cable.

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743power
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by 743power

Do you have the original red gore cables? If so, I would swap out the inner cable first and check all the ferrules for signs of clogging from the coating that's shredded off the cable.

After that, peel back or remove the hood and check for dirt or debris inside the shifter, particularly towards the bottom. Spray some alcohol or fast disolving solvent like clean streak in there, let it dry and put some grease on the pawls and ratchet gear. Just a dab or two with a q tip is fine.
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Juanmoretime
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by Juanmoretime

I have been in contact with SRAM. They think that it is probably gummed up. They suggested removing the cover on the shifter and spraying alcohol to clean it out and then re-lubing the insides. It will be done tonight.

I did swap out the cable earlier in the process.
RESIDENT GRUMPY OLD MAN.

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Juanmoretime
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by Juanmoretime

Did as SRAM recommended and it did the same thing the next day. Worked awesome after cleaning it out and then lubing it. Rode in the cold the next day and it would not stay in the big ring. I think I will try to clean and re-lube it one more time and if it doesn't work take it apart for a better look.
RESIDENT GRUMPY OLD MAN.

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theremery
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by theremery

I'm gonna guess it's a steel cable, Juan. Just a tiny bit of expansion/contraction of the cable going on? (maybe exacerbated by clingy grease getting a little thicker as it cools). Give it a QUICK SPRAY OUT with crc or similar to reduce internal grit and re-cable it and she'll be back to normal, would be my guess. I'd certainly give it a go! (you'll have to get SOME lube back in there somehow too).
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