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Missing downtube shifter plastic piece--what would I call this?

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Missing downtube shifter plastic piece--what would I call this?

Old 01-29-16, 06:49 PM
  #1  
jPrichard10 
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Missing downtube shifter plastic piece--what would I call this?

https://www.flickr.com/photos/allenhopper/7294156228

Hi all,

I'm new to the downtube shifters on braze-ons world. I bought a bike with those fragile Shimano indexing levers and I'm switching them out with Suntour Sprint ratcheting levers. The plastic chrome piece that fits closest to the frame I want to keep with the Shimano shifters (they engage with it). So now I need two of the plastichrome, concave pieces (#7 in the shifter above). I don't know what I would call these and if they're universal or not.

Would any shop have these? What would I call them?
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Old 01-29-16, 07:06 PM
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What happened to the ones that came with those fragile Shimano indexing levers?
If not, they're called "collars" or "backing plates" and come in both a concave-back and flat-back style.

Someone likely has some. I used to have a pair, but answered a query like this on the ISO/Trade thread, and mailed them out.
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Old 01-29-16, 07:11 PM
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I think I have a set, let me check Tomorrow when I get home.
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Old 01-29-16, 07:14 PM
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Originally Posted by jPrichard10 View Post
https://www.flickr.com/photos/allenhopper/7294156228
(#7 in the shifter above). Would any shop have these? What would I call them?
None of the bicycle shop available to me have any old parts (and darn few new ones on hand). Looking for parts for a project bike is how I found my local bicycle co-op. Co-ops work with used bikes and old parts.
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Old 01-29-16, 07:32 PM
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Yeah, when I say "bike shop" I almost exclusively mean a bike co-op. The only reason I have to set foot in a bike shop is for the occasional emergency tube.

The ones that came with the frame have little notches that interact with indexed shifters. I want to keep them with the Shimano indexed levers, and I wasn't sure how that surface would interact with my Suntour friction shifters.
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Old 01-30-16, 07:36 AM
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I don't think you use them with the Suntour friction shifters. At all. The Suntour shifters don't use them that I know of.
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Old 01-30-16, 10:34 AM
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Originally Posted by jPrichard10 View Post
I'm switching them out with Suntour Sprint ratcheting levers.
Originally Posted by RobbieTunes View Post
I don't think you use them with the Suntour friction shifters. At all. The Suntour shifters don't use them that I know of.
Robbie's right- the square base of the boss fits into the square "hole" in the plate on the shifter.

Let me know if you'd like pix!
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Old 01-30-16, 11:54 AM
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The proper Shimano terminology is "lever boss cover". There was some compatibility between groups but I'm not sure if they were universal.
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Old 01-31-16, 11:56 PM
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I tried not using anything--the lever can't get tight enough on the boss and just spins freely... I need something else on the boss to at least give a little resistance.

I also tried to use the original "lever boss cover." The indexing bumps/notches make the lever crooked on the boss, and it doesn't work properly at all.

The bosses are on a Trek 400T from 1987, if those bosses are special in some way.
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Old 02-01-16, 03:06 AM
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I love downtime shifters.....
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Old 02-01-16, 07:33 AM
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I have one of these you're welcome to if it is what you need. Not sure where it came from or why I only have one. The inside face which interfaces against the frame has a curve and square inset which look just like the exploded drawing you posted. The outside has an inner raised boss diameter and tab. It is actually prettier than the pictures suggest. And I think it is plated die cast metal. Posting will be cheap enough, if you want it send me a PM with your address and I'll send it no charge.
Alex
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Old 02-01-16, 05:49 PM
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This looks like it. You could check Shimano tech docs and see if they are all the same.

Shimano SL-7800 Shift Lever Boss Cover Radiused
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Old 02-01-16, 06:51 PM
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That raised boss and tab are what's causing my shifter to not attach straight. That's the same as the ones that came with my frame.

Sorry for no pictures. Coming soon.
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Old 02-02-16, 05:29 AM
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Originally Posted by jPrichard10 View Post
That raised boss and tab are what's causing my shifter to not attach straight.
Well if you cant find the right ones, Dremel tool.
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Old 02-02-16, 11:17 PM
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The manual scan for these shifters shows two flat boss covers and one or two washers. I found two semi-concave boss covers and used a couple washers and it works great!

VeloBase.com - Component: SunTour Sprint
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Old 02-03-16, 04:45 AM
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I do know for sure that the six speed indexed and the 7 speed indexed downtube shifters use the same lever boss covers. I switched up my Miyata with a set of 7 speed shifters (from 6) that was missing one, and the old one was a match.
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