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Need Help with Shifter Boss Adapter Conversion

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Need Help with Shifter Boss Adapter Conversion

Old 09-11-20, 08:26 AM
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roccobike
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Need Help with Shifter Boss Adapter Conversion

I purchased a Ross Signature bike from a forum member some time ago. I've finally got to it on my project list. I wanted this bike because of the excellent ride provided by the triple butted, Ishiwata steel frame. This bike will be a rider so I'm not concerned about originality. I want to convert it to a brifter bike with Shimano RSX 2X7 shifters. I'm all set to mount the shifters but when I tried to attach the cable adapters to the shifter bosses on the frame, nothing doing, they won't fit. The bosses work with Shimano, friction downtube shifters and are not the same bosses found on a frame with Shimano index shifters. They have a notch on them the index bosses don't have and they don't extend as far as the index bosses. I'm OK with all that but I need to know will any other adapters work with these shifter bosses? I went on ebay and found some Campagnolo adapters and some other brand I'm not familiar with, but I'm reluctent to buy unless I'm fairly sure they'll work.
I know I can simply put a vintage, chrome cable stop that I have in my spare parts bin, but that won't look nearly as good as adapters that will work with those shifter bosses.
Does anyone know if there's an adapter that I can bolt up to these shifter bosses?
Here's a pic of the Ross frame bosses and a pic of the standard Shimano adapters that I thought would work, but don't.
Thanks for any help.

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Old 09-11-20, 08:30 AM
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Originally Posted by roccobike View Post
I purchased a Ross Signature bike from a forum member some time ago. I've finally got to it on my project list. I wanted this bike because of the excellent ride provided by the triple butted, Ishiwata steel frame. This bike will be a rider so I'm not concerned about originality. I want to convert it to a brifter bike with Shimano RSX 2X7 shifters. I'm all set to mount the shifters but when I tried to attach the cable adapters to the shifter bosses on the frame, nothing doing, they won't fit. The bosses work with Shimano, friction downtube shifters and are not the same bosses found on a frame with Shimano index shifters. They have a notch on them the index bosses don't have and they don't extend as far as the index bosses. I'm OK with all that but I need to know will any other adapters work with these shifter bosses? I went on ebay and found some Campagnolo adapters and some other brand I'm not familiar with, but I'm reluctent to buy unless I'm fairly sure they'll work.
I know I can simply put a vintage, chrome cable stop that I have in my spare parts bin, but that won't look nearly as good as adapters that will work with those shifter bosses.
Does anyone know if there's an adapter that I can bolt up to these shifter bosses?
Here's a pic of the Ross frame bosses and a pic of the standard Shimano adapters that I thought would work, but don't.
Thanks for any help.

I have some info on this somewhere. I had a Schwinn Voyageur with the same bosses. I think you have to file a notch in the body of the cable stop. I traded the bike before I ever tried to install my barcons. Lemme see if I can find that link somewhere.

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Old 09-11-20, 08:45 AM
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Found the link

https://simplicityvintagecycles.com/...saAoPA3KMmoEw0
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Old 09-11-20, 09:09 AM
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Sounds like Shimano Type A bosses. If so they are also 4.5mm thread, not 5mm like just about every other bike on the planet. I have an '84 Schwinn Tempo with the same affliction. I have a set of stops that have been notched and was going to get the right 4.5 screws but I've finally given up finding screws and bought a 5mm tap.

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Old 09-11-20, 09:59 AM
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Originally Posted by Phamilton View Post
I have some info on this somewhere. I had a Schwinn Voyageur with the same bosses. I think you have to file a notch in the body of the cable stop. I traded the bike before I ever tried to install my barcons. Lemme see if I can find that link somewhere.
+1. Been there, done that. Turned out fine. The Origin8 cable stops are a bit easier to work on than the Shimano.

Originally Posted by Murray Missile View Post
Sounds like Shimano Type A bosses. If so they are also 4.5mm thread, not 5mm like just about every other bike on the planet. I have an '84 Schwinn Tempo with the same affliction. I have a set of stops that have been notched and was going to get the right 4.5 screws but I've finally given up finding screws and bought a 5mm tap.
Exactly. I got 4.5 bolts from Fastenal. Tapping is probably a better idea.

I bought a fake Dremel at Aldi and use a B&D Workmate to hold the cable stop.
I don't have a bench or a vice, so I made do.

Al, great to see you on the forums.
Your issues may be due to my long-term curse on you for hoarding Ironman bikes.
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Old 09-11-20, 11:36 AM
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Thank you for the responses. Now I know what I have to do. Also, thanks for anticipating the question about the threads. That would have been my next question once I got passed the adapter question.
Robbie, I still have two Ironman bikes. Both are now set up to do short rides, both with all OEM shifters, gears and brakes. I'm going to convert one to a brifter bike.
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