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downtube shifters

Old 07-01-13, 09:16 PM
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The_Joe
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downtube shifters

My bike has braze ons for downtube shifters but I have found a set of derailleurs that has top mount shifters. Can they be modified to fit braze ons?
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Old 07-01-13, 09:46 PM
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Originally Posted by The_Joe View Post
My bike has braze ons for downtube shifters but I have found a set of derailleurs that has top mount shifters. Can they be modified to fit braze ons?
Friction derailleurs don't care where the levers are located. I assume you mean you found a set of stem-mounted levers, and want to know if you can fit them to the downtube studs. I've never found an easy way to do it. Of course every brand's stem shifters seem to be different. Some may even have the same diameter barrell as the DT studs. The problem is all the other stuff, the mounting components and friction bits. You'd probably do better by just finding a decent pair of DT levers.

One thing to be aware of with mixing different levers and derailleurs is they were sometimes intended to work with different amounts of cable movement. A Simplex lever, for example, on a Suntour VGT-Luxe RD will require a large swing of the lever from full-high to full-low. It's not a show-stopper problem but just don't be surprised if the sensitivity seems more or less than you expected.
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Old 07-01-13, 09:59 PM
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Originally Posted by jimmuller View Post
Friction derailleurs don't care where the levers are located. I assume you mean you found a set of stem-mounted levers, and want to know if you can fit them to the downtube studs. I've never found an easy way to do it. Of course every brand's stem shifters seem to be different. Some may even have the same diameter barrell as the DT studs. The problem is all the other stuff, the mounting components and friction bits. You'd probably do better by just finding a decent pair of DT levers.

One thing to be aware of with mixing different levers and derailleurs is they were sometimes intended to work with different amounts of cable movement. A Simplex lever, for example, on a Suntour VGT-Luxe RD will require a large swing of the lever from full-high to full-low. It's not a show-stopper problem but just don't be surprised if the sensitivity seems more or less than you expected.

Thanks for the response, Jim. Thats not exactly what I meant though. What I mean is that my frame came stock with suntour cyclone so I am looking to put that back on it. I have found a set of rd/fd/shifters for a good price but the shifters are not the usual downtube shifters. They are on the downtube but they are the kind that sit above the tube rather than on either side.
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Old 07-01-13, 10:08 PM
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I would not try to modify the top mount Cyclones to fit your side mount braze ons. You should be able to used your Cyclone derailleurs with your existing shifters.
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Old 07-01-13, 10:09 PM
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Those are usually called aero DT shifters. Dunno if they can be removed from aero mount and made to fit standard DT bosses or not.
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Old 07-01-13, 10:24 PM
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Thanks Lesterofpuppets. That is what I thought. Glad I cleared that up before taking a chance. Sadly, cb400bill the frame came to me stripped and has no shifters.
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Old 07-02-13, 06:08 AM
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Shift levers show up on ebay quite frequently. You may have to patient to find something at a decent price though.
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Old 07-02-13, 09:19 AM
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Originally Posted by jimmuller View Post
Shift levers show up on ebay quite frequently. You may have to patient to find something at a decent price though.
This was a package deal of NOS parts. I was able to talk the guy down in price so I grabbed it. The derailleurs are worth what I paid. I'll try and move the shifters online and get different ones.
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Old 07-02-13, 09:26 AM
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I wonder if the bosses used on the aero mount are the same? You could try disassembling one shifter and see if it fits on the downtube braze on.

Here is an older thread on Suntour downtube shifters, might help a bit
https://www.bikeforums.net/showthread...tting-together
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Old 07-02-13, 10:47 AM
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It should fit fine, but you will need to use Shimano type screws to hold the levers to the braze ons as the thread pattern is different than those screws that came with your "aero" levers.
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