GUIDE: Repairing Shimano RX100 (A550) STI Levers
- QuangVuong
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GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Fri Mar 29, 2013 6:52 pm
RX100 levers are not symmetrical. The right side lever is different to the left side lever. So I will be going through both left and right sides in this guide.
This is the right lever. Remove the hood, and use a 2mm allen key to remove this grab screw. It does have a little bit of threadlock, so it may be a little hard to unscrew.
Use the same hex key to push out the pivot. Now you can take the lever away from the body.
Next, use a 5mm hex key to remove the screw holding on the name plate. Make sure youre holding onto both the name plate and the lever when unscrewing.
You will be greeted with this spring. This is different to the assembly of the new Sora(3300) and 105(5500) levers. Id say its much more easy to dismantle and rebuild because the spring is here.
Now flip to the back side of the lever. Push the smaller lever over so the screw is visible. Unscrew with a small Phillips, and watch out for the small washer underneath.
Now, just pull the lever right off. No springs underneath like on the new levers, so its very simple.
Very simple. The internal gears have been reached, and now you can ahead with cleaning it. I am using fuel, but you can use your degreaser, or whatever youd like.
Silly me forgot to take pics of when it was all clean. Oh well, you can find the pawls, and grease those areas up.
Now onto the left lever. As you can see its different in shape.
Remove the hood, and use a 2mm allen key to remove this grab screw. It does have a little bit of threadlock, so it may be a little hard to unscrew.
Use the same hex key to push out the pivot. Now you can take the lever away from the body.
Next, use a 5mm hex key to remove the screw holding on the name plate. Make sure youre holding onto both the name plate and the lever when unscrewing. (Yes this is the pic of the right side, but its the same thing as the left)
Its odd that the spring stayed like this when I pulled it off. It should be like the pic of the right side. Pulled it out, and noticed the spring that was supposed to be bent at a right angle was bent to almost straight again. Rebent to a right angle, and everything was fine again.
Gummy grease!
Now the left lever has a plastic cover which may get in the way of cleaning. Using a toothbrush, you'd get to most places, but there are places where you cannot get to. This is where I got my airbrush out and filled it up with some fuel. At max air pressure, I sprayed, and blocks of grease flew out. Keep repeating this til theres nothing else coming out.
You can go ahead and grease the pawls.
Final result after a polish of the levers. Would've liked to remove the rashes from the name plate, but preferred to keep the RX100 logo there.
Oh, and I will offer a service to rebuild STI levers. So far I have done the Sora(3300), 105(5500) and the RX100 as above, but I am sure that I can get around to doing the others without too many problems. I will also gladly take in any broken shifters, or ones that do not work anymore. Please PM me if youre interested!
Reason: Restore photo links
- find_bruce
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby find_bruce » Fri Mar 29, 2013 7:57 pm
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Fri Mar 29, 2013 8:45 pm
Next up will be the RSX, which I would say are 99% the same as these. Oh well, its also gummed up, so another rebuild in maybe 2 weeks.
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Thu Apr 25, 2013 7:52 pm
viewtopic.php?f=34&t=63753" onclick="window.open(this.href);return false;
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- Milar
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby Milar » Thu Apr 25, 2013 8:26 pm
- QuangVuong
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Wed Jul 03, 2013 5:27 pm
viewtopic.php?f=34&t=65831" onclick="window.open(this.href);return false;
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Bike Question
Postby PeppeX » Sun Oct 13, 2013 1:00 pm
Just looked at your RX100 reparing thread. I opened the left shifter and the spring is there. But I can't seem to slot everything back in place, because the spring has the right angles bit sticking out and I guess they are suppose to go into the little hole in the lever and there is another hole/slot in the cap. But they do not match up? Do I need to twist the spring to make sure they are in the slot before putting the screw on?
Hopefully I am making sense
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Sun Oct 13, 2013 1:44 pm
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- martc101
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby martc101 » Mon Apr 21, 2014 10:48 pm
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby banksy20 » Fri Nov 21, 2014 2:26 pm
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Fri Nov 21, 2014 9:38 pm
ST-1055 hoods are what you want. RSX a, 105 and RX100 all used that hood. Pretty sure 6400 and DA fit it too.
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- singlespeedscott
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby singlespeedscott » Sat Nov 22, 2014 6:43 pm
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby velocipedist » Mon May 04, 2015 10:46 pm
The spring is Shimano part no 66E 7300 - pictured here in the write-up above:
I've picked up some rx-100 shifters - the left one works, but the right side is missing the spring and o-ring. The o-ring I can live without, but the spring is kind of important
Its for the resurrection of my old tange double-butted Fuji which came with ST-A551 8-speed rx-100 downtubes on it. I'm trying to keep it all rx-100. The spring appears to be identical on ST-1055 and ST-6400 too - but I'd rather not have to buy a whole shifter just to cannibalise the spring out of it.
My bike: viewtopic.php?f=34&t=82010" onclick="window.open(this.href);return false;
- QuangVuong
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GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Mon May 04, 2015 10:55 pm
I'll have a look in the bag, where the smaller bits may have fallen to the bottom, but, I'm really thinking I don't have any spare ones.
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby velocipedist » Tue May 05, 2015 2:26 pm
I asked the California-based rebuilder of the same series of STI shifters, and he also has none, so I've just sent an enquiry to Shimano in Australia asking whether the parts are even available new.
Parts diagram in german: https://www.paul-lange.de/support/shima ... 550-94.PDF" onclick="window.open(this.href);return false;
I've also just spent 10 minutes researching what it would take to make the missing spring - seems like its not too hard.
After measuring the left-side spring, critical dimensions are:
OD 20mm
Gauge: 1mm
Pitch: 1.5mm
Turns: 3.25
Material: Carbon spring steel (its magnetic - so not stainless).
So one option is to order some size 17.5 Piano wire (aka Music Wire - just carbon spring wire) which has 1.016mm thickness, wind it on something like an M20 (or maybe M18) threaded surface, which is also 1.5mm pitch, and then heat treat it to relax the coils.
The challenge is getting a left-threaded M20 bolt to use as an arbor for winding the spring for the right-side shifter as it needs to twist the opposite way. I'm thinking some brass rod, some beer and a friend with a serious lathe should take care of that (beer for afterwards! beer and metal lathes don't mix ).
If Shimano come back saying its available then great, but the backup plan is to try the piano wire.
- QuangVuong
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- Joined: Sun Feb 24, 2013 5:04 pm
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Re: GUIDE: Repairing Shimano RX100 (A550) STI Levers
Postby QuangVuong » Tue May 05, 2015 2:36 pm
Good luck with making one.
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