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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-23-14, 05:02 PM   #1
PatTheSlat 
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9 Speed Shimano 105 STIs are driving me crazy!

I'm setting up a bike with brifters for the first time (105 9 speed (st-5500) shifters shifting a Dura Ace 7700 derailleur over an Ultegra 9 speed cassette), and the right shifter is driving me crazy. It works 100% fine with no cable in it. It works 100% fine with a cable in it and me pulling the cable to create cable tension. When I add cable housing is when it all goes to hell, and doesn't want to upshift (into smaller cogs). It does this both with the cable running all the way to the rear derailleur, and with me just pulling on the cable where it comes out of the housing on the downtube stop. I've tried different cables, different housing, longer housing, different ferrules, and a full cleaning/relubing of the shifter. Nothing has worked.

I made a video to show exactly what's happening: https://www.youtube.com/watch?v=wxqtmtXR2Ec

Anyone have any ideas? I would think that if it was a lubrication issue, the shifter wouldn't work with no cable, and I would think that if it was a wear issue, it wouldn't work with me putting tension on the cable. I'm stumped.
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Old 06-24-14, 09:38 AM   #2
fietsbob 
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Pay a bike shop to do the work (in Person) out of the money Google pays you for all the hits your video may get..

though Kittens doing cute things are more popular.
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Old 06-24-14, 06:32 PM   #3
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I have very little experience with STI levers, but I did read the extensive comment on the YouTube video about flushing the lever out with WD-40. Awhile back I ended up purchasing something on eBay from Bikemanforu, who has a lot of videos on YouTube (he and his family are funny). Anyway, there was one in which he got a gummed up Deore XT Rapid Fire lever working again by spraying CRC Brakleen into it.
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Old 06-24-14, 09:17 PM   #4
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I don't know. Are you using a brake cable instead of a derailleur cable?
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Old 06-24-14, 10:13 PM   #5
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check your cable housing to make sure that you dont have any kinks in it.
check that your cable has no kinks.
that you are running shift and not brake housing.
stop into your local shop, with your bike and a pack of beer and you will be in and out faster then making a video.
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Old 06-24-14, 11:59 PM   #6
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Not enough tension on the cable, use more leverage... RD probably has a spring tension adjustment, take it apart and put the spring in the tighter position. Shifter is probably gunked up too, keep cleaning it out and lubricating it.
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Old 06-25-14, 05:01 AM   #7
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Alright, that's a bit weird...

What you're seeing is a symptom of tired 9s STIs, where the return spring for the upshift lever doesn't stop it from moving a bit when you hit the downshift lever, causing the mechanism to jam.

I bet if you grow another hand and pull on the cable while holding the upshift lever against its stop, and hit the downshift lever, it works.

The weird part is how threading your cable through the housing makes the difference between this fault occurring and not... seems like it's only just happening, with the slight difference in force caused by the housing making it show up.

Goes to show, at least for these 9s ones, a demo off the bike proves nothing.

I repaired this fault in some ST-6500s by tweaking the upshift return springs stronger and the downshift return springs weaker, but it's major surgery and the results weren't entirely satisfactory.

Sadly, I believe your lever is virtually toast. Unless you're game to try your hand at STI wrangling... more watchmaking than bicycle mechanics.

If so, check the link in my tag for more.

ETA: I just figured out the weird bit - when you're pulling on the bare cable, you're helping the upshift lever's return spring because the force isn't balanced by the pressure of the housing end. This prevents the upshift lever from moving so much and jamming. This doesn't explain why the lever works with no cable, though. Subtle and tricky stuff...

Last edited by Kimmo; 06-25-14 at 05:05 AM.
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Old 06-25-14, 05:24 AM   #8
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Quick and dirty fix

A slice of MTB tube:



...Except it tends to create the opposite problem; the bit in between the levers tends to prevent the downshift lever from reaching its stop, causing the lever to jam on upshifts...

Here, this works better:


Last edited by Kimmo; 06-25-14 at 05:32 AM.
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Old 06-26-14, 07:46 AM   #9
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/bump

Check out this one weird trick that will save your old shifters from the scrap pile!

should be the thread title now
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