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Oops. Disassembled st-m050r rapid fire shifter! How bad is it?

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Oops. Disassembled st-m050r rapid fire shifter! How bad is it?

Old 06-11-21, 02:09 PM
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Oops. Disassembled st-m050r rapid fire shifter! How bad is it?

I need help putting back together a st-m050r STI rapid fire shifter 🙄. I soaked it and sprayed it and got impatient. I figured worse case scenario I could find an exploded diagram for assistance. They aren't on the net.

Ive looked at the threads and everyone says they aren't intended to be serviced. But none of the parts require breaking for removal. Someone put it together, so I can too...(apparently not).

Any way you guys could help me get this back together, wise ones? I've learned a valuable lesson and will treat the layers like a compass in the future to preserve orientation.

Thanks Andy #2
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Old 06-11-21, 02:39 PM
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I hate stupid polls.
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Old 06-11-21, 02:52 PM
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Oof. I'd just seek out a replacement, but that's me.

Here's a video of someone rebuilding a different Shimano shifter -- maybe there are enough similarities that you can apply some of what he's doing to yours.

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Old 06-11-21, 03:01 PM
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Don't know you'll find exact one but similar.

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Old 06-11-21, 04:03 PM
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Why on earth would you take a Shimano shifter apart? I won't piss you off with what you should have done but only offer this advice: Buy a new shifter and don't ever take it apart in the future.
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Old 06-11-21, 05:01 PM
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Originally Posted by cxwrench View Post
Why on earth would you take a Shimano shifter apart? I won't piss you off with what you should have done but only offer this advice: Buy a new shifter and don't ever take it apart in the future.
I'd take one apart but...
Take plenty of pictures as it comes apart, knowing full well that it could very well be a fatal mistake, and have a replacement available.
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Old 06-11-21, 05:31 PM
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Next time, remove only the cover. Sometimes you need to remove the cable to get the cover off. Get a dental pick and find the pawl that's sticking. Lube it and work it until it's free.

I've been able to reassemble road shifters. Tensioning the torsion springs is the hardest part. You may need a clockmaker's skills. Good luck with yours.

I didn't vote. With the right skills and some time, it's possible but I have no idea if you have those.
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Old 06-11-21, 06:29 PM
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Originally Posted by Bill Kapaun View Post
I hate stupid polls.
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Poll: do we like this comment?

1 = no2 = yes
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Old 06-11-21, 07:41 PM
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Originally Posted by andrewclaus View Post
Next time, remove only the cover. Sometimes you need to remove the cable to get the cover off. Get a dental pick and find the pawl that's sticking. Lube it and work it until it's free.

I've been able to reassemble road shifters. Tensioning the torsion springs is the hardest part. You may need a clockmaker's skills. Good luck with yours.

I didn't vote. With the right skills and some time, it's possible but I have no idea if you have those.
Thanks for the info! Yeah, it wasn't sticky, it was seized... I should have been more patient but I also must admit I enjoy taking things apart. Worse case scenario, I buy another. Best cast scenario, I will have content for YouTube!
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Old 06-14-21, 09:01 PM
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Well whaddya know?

Guys,

I got the shifter back together. It's so strange, it over shoots the ridges the pawl hits if you don't have the cover on... Caused me to tear it down a few times thinking I assembled it incorrectly.v definitely challenging. I won't tell you how much Time I have in that thing.

Was thinking about making a video.
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