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Clamp on down tube 'braze on' bosses for shifters

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Clamp on down tube 'braze on' bosses for shifters

Old 08-29-05, 09:20 PM
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cuda2k
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Clamp on down tube 'braze on' bosses for shifters

I know the exist (or at least existed at one point in time) - but here's what I'm trying to locate a source for:

I have a mid 80's road bike with no brazed on downtube bosses for downtube shifters. I am most certainly crazy and looking to put on 7 or 8 speed indexed downtube shifters on it with require the brazed on bosses. Has anyone seen, over heard a rumor of, know where I can get a clamp on that will replace this bosses for me to mount the shifters. As I said, I found one (ended) ebay auction for a pair of shifters that included just such a clamp. Now just to find another one. Thanks ahead of time for any help.
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Old 08-29-05, 09:37 PM
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when I did an ebay search (a few weeks ago) there were several clamp on shifters avail. I remember a campy and a couple shimano. But then again I was looking @ friction shifters, is there a big difference for indexed shifters.
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Old 08-29-05, 09:52 PM
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Check www.yellowjersey.org. They have a lot of NOS stuff for sale -- not as cheap as you'd typically find on eBay, but you can probably pick up an entire late 80s drivetrain in brand-new condition. They're good guys -- just bought a set of handbuilt wheels (Velocity w/ Chorus hubs) from them, and they took the time to space out seven cogs (on a brand new Campy cassette) to exactly match my 1988 Suntour Winner Pro Ultra 7 freewheel.

Yep, I'm crazy too and I love my old steel-framed, Superbe Pro-equipped racer w/Accushift. And I love giving the "Lance look" to people on their $5,000 Madones!
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Old 08-30-05, 06:27 AM
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Yeah, friction isn't much of a problem to find for clamp on, I have a Shimano 105 Golden Arrow downtube shifter that I'm currently using on one bike with a 6 speed freewheel. I was planning on spreading the rear stays on a newer steel frame to take an 8 speed cassette along with some 8speed 105 derailleurs I have. The indexed shifting would be nice as not to have to play with the trimming of the thing as I'm cranking up a hill because I slightly over shifted at one point or another.
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Old 08-30-05, 06:42 AM
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I don't know if this will work but if you get a set of clamp-on friction shifters and remove the shift levers, are the lever mounting bosses compatible with braze-on shifter levers? If so, there is your solution.

Another approach is to get a set of indexing barcon levers. You will need a clamp-on downtube cable stop but these are certainly available (stem shifter bikes used them). BTW, if you use barcons you could go all the way to 9-speed.

One caveat, check your derailleur hanger alignment. Bikes made before index shifting was standard were less precisely aligned since friction shifting was tolerant of minor misalignment.
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Old 08-30-05, 06:50 AM
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Originally Posted by HillRider
I don't know if this will work but if you get a set of clamp-on friction shifters and remove the shift levers, are the lever mounting bosses compatible with braze-on shifter levers?
Not usually.
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Old 08-30-05, 01:14 PM
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You may be out of luck. By the time index shifting came out, almost all bikes were being built with braze-ons for the shifters. I don't think I've ever seen a set of clamp-on index shifters.
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Old 08-30-05, 01:28 PM
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I know for a fact that at the very least you can get old Suntour Accushift (indexed) stuff with clamp-on shifters. I'm 99% sure you can get most older Shimano SIS stuff in clamp-on varieties as well. Selling aftermarket indexed shifting kits for older bikes was a big deal in the late 1980s/early 1990s; many of these offered clamp-mounted shifters as an option because so many frames produced before the mid 1980s had no braze-ons for shifters. Diligent eBay searching should prove fruitful.
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Old 08-30-05, 03:20 PM
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More searching did turn up some success on ebay. Currently looking at some Shimano 600EX indexed clamp ons. Thanks everyone.
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