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Early 1980's Proprietary Shimano Shifter Bosses

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Early 1980's Proprietary Shimano Shifter Bosses

Old 12-16-12, 03:20 PM
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ZippyThePinhead
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Early 1980's Proprietary Shimano Shifter Bosses

In a different thread someone reminded me of a question that I've been wondering about.

Similar to the 1985 Raleigh Super Course pictured in that thread, I have a 1983 SR Semi Pro. It's not 100% original, but it has Arabesque components, and of late I find myself thinking that it might be desirable (educationally and practically) to upgrade to brifters.

What is it about those Shimano bosses that creates an impediment? Is it the screw size (4.5mm or some such)? Am I to understand that if I buy some of these, I need to use a different size screw to put them on my bike? Pictures below. Can I use the screws that currently hold my shifters on for cable stops?






From below.
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Old 12-16-12, 04:30 PM
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Originally Posted by ZippyThePinhead View Post
In a different thread someone reminded me of a question that I've been wondering about.

Similar to the 1985 Raleigh Super Course pictured in that thread, I have a 1983 SR Semi Pro. It's not 100% original, but it has Arabesque components, and of late I find myself thinking that it might be desirable (educationally and practically) to upgrade to brifters.

What is it about those Shimano bosses that creates an impediment? Is it the screw size (4.5mm or some such)?
Am I to understand that if I buy some of these, I need to use a different size screw to put them on my bike?
Can I use the screws that currently hold my shifters on for cable stops?
Yes,
Yes,
Yes.

You will probably need to do minor surgery to the back of the cable stops in order to make them fit over/around the existing shift lever bosses. A possible way around this is a clamp-on cable stop like this: https://www.universalcycles.com/shopp...&category=1613 and some inline cable adjusters.
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Old 12-16-12, 05:09 PM
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I saw this, didn't look too hard to copy his solution. However I did a quickie google search for 4.5mm screws, and came up with nothing. Is this the real issue? Is there some source of reasonably-priced 4.5mm screws? I'd rather use a proper metric screw if I can get one.
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Old 12-16-12, 05:31 PM
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Originally Posted by ZippyThePinhead View Post
I saw this, didn't look too hard to copy his solution. However I did a quickie google search for 4.5mm screws, and came up with nothing. Is this the real issue? Is there some source of reasonably-priced 4.5mm screws? I'd rather use a proper metric screw if I can get one.
Interesting that the page mentions a couple possible solutions: using a "standard" thread screw (presumably SAE) and tapping the boss for 5mm screws. I don't know if either is an acceptable solution to your issue.

Mrph... apparently even Grainger doesn't list a 4.5mm thread screw: https://www.grainger.com/Grainger/mac...071&sst=subset
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Old 12-16-12, 05:39 PM
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I found some M4.5 screws on eBay. Other threads here on BF mention retapping to M5/5mm.
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Old 12-16-12, 07:40 PM
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Originally Posted by ZippyThePinhead View Post
I found some M4.5 screws on eBay. Other threads here on BF mention retapping to M5/5mm.
Wow! If those are made for holding carbide inserts on a CNC lathe, I think they'll be good for your cable stops.
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Old 11-26-13, 07:31 PM
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Did anyone have success with this? Modifying the newer shifters to work on the old stops on the bosses?
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Old 11-26-13, 08:07 PM
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I had success altering the bosses to fit modern shifting components and then tapping the boss for a 5mm screw.
Do a thread search, you'll find it...
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Old 12-03-13, 09:22 PM
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Originally Posted by rccardr View Post
I had success altering the bosses to fit modern shifting components and then tapping the boss for a 5mm screw.
Do a thread search, you'll find it...
Thanks for the link in the other thread. Thats is the type of info I been hoping for since summer. I do not have internet at home so my search time is limited.
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