Downtube Shifters
Downtube Shifters
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 VINTAGE Campagnolo Downtube Shifter set  US $45.00
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 Campagnolo Vintage Downtube Shifters GREAT CONDITION US $12.50
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 Shimano RX 100 Down Tube Shifters 7 Speed US $10.49
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 Shimano Sante Santé Downtube Shifters SL 5000 from 80s US $19.99
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 Shimano 600 SL 6400 Downtube SIS 7 speed Shifters Shift Levers Rare Aero Mount US $24.95
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 Shimano Dura Ace Downtube Shifter SL7401 7 Speed SIS US $12.50
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 Suntour Superbe Pro Downtube Shifters 6 and 7 Speed US $1.04
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 Downtube clamp for adapting Campy ErgoShimano STI Cable Stops and Adjusters US $10.75
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 Shimano Dura Ace Down Tube Shift Levers 7402 Vintage US $11.00
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 Suntour Downtube 7 spd accushifters US $5.00
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 SUNTOUR BICYCLE DOWNTUBE BRAZE ON 6 X 2 SPEED FRICTION SHIFTERS US $22.00
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 Shimano Dura Ace DownTube Shifter Set 9 Speed US $98.99
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 SHIMANO ULTEGRA 600 SL 6400 FRICTION STI DOWNTUBE DOWN TUBE SHIFTERS PARTS US $1.00
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 Suntour STEM SHIFTERS for Road Bicycles FREE Shipping on Additional Items US $4.99
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 SHIMANO DURA ACE SL 7900 10 SPEED DOWN TUBE SHIFTERS US $63.87
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 Vintage Campagnolo 7 Speed Down Tube Road Bike Shifters US $.99
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 Vintage Campagnolo Nuovo Record Downtube Road Bike Shifters LK US $.99
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 Shimano Downtube Friction Shifter Levers Dura Ace 600 Golden Arrow US $19.99
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 Campagnolo downtube braze on gear cable stop tension adjusters Ergopower NEW US $18.49
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 Shimano Ultegra Downtube Adjusters for STI Shifters Dura Ace RSX 105 600 RX100 US $12.99
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 Vintage 1979 Suntour POWER Shifters Cable Guide Gear Shifters Sun Tour US $9.99
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 VINTAGE SIMPLEX DOWNTUBE DERAIILEUR SHIFTERS DOWN TUBE MODELE DEPOSE US $10.00
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 NORMA Downtube Shifters Clamp 318 Shimano STI Suntour Campagnolo Index Capable US $49.99
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 NOS NIB suntour superbe pro shifters down tube 6 or 7 speed accushift plus US $51.00
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 Shimano Barend Shifters downtube levers shifter pods friction Ultegra Dura Ace US $.99
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 Shimano Dura Ace Downtube Adjusters for STI Shifters RSX 105 600 Ultegra RX100 US $14.99
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 Campagnolo Victory friction downtube shifters US $40.00
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 NOS Suntour Schwinn Approved Shifters Shift Levers for braze on mounts NEW US $9.99
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 Cable Stop Clamp Downtube with Adjusters 4 Shimano STI US $24.95
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 NOS Suntour Accushift Plus Shifters 7 Speed Shift Levers for braze on mounts NEW US $24.95
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 LOT OF SUNTOUR DURA ACE BIKE PARTS CRANKS DOWN TUBE SHIFTERS TURBO SEAT US $10.00
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 Suntour Cyclone Symmetric Shifters Self Trimming Front 286mm US $19.99
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 DOWNTUBE SHIFTER BOSS CLAMP BAND 4 CAMPAGNOLO SHIMANO US $21.95
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 Shimano Dura Ace Ultegra STI Downtube Cable Stop w Adjuster Set of Two US $24.95
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 Shimano Down Tube Shifter Cable Bosses fit Sram Trek US $14.99
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 Shimano Dura Ace Down Tube Shifter Cable Bosses works with Sram or Shimano STI US $15.99
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 NEW CAMPAGNOLO DOWNTUBE DOWN TUBE CABLE STI ADJUSTER US $15.95
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 NEW Huret Shifter Boss Downtube Band Clamp 286 NOS US $4.95
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 CAMPAGNOLO C RECORD SHIFTERS 7 SPEED FRICTION NOS NEW NIB VINTAGE RARE US $149.00
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 VINTAGE SUNTOUR BICYCLE DOWNTUBE POWER SHIFTERS US $26.00
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 Shifter Boss clamp 4 Shimano STI downtube cable stops US $10.75
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 SHIMANO DURA ACE 7700 downtube shifters 9 SPEED SL 7700 US $74.90
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 Shimano Dura Ace Downtube Shifters 8 Speed SL 7402 US $64.95
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 Campagnolo Syncro II C Record Right Shifter Down Tube Vintage 7spd US $39.00
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 Vintage Campagnolo Victory Downtube Friction Shifters Braze on US $39.99
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 Vintage Shimano Dura Ace 7400 SL 7402 Downtube Index Shifters 8sp 8 Speed US $59.99
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 SHIMANO SORA SL R400 8 SPEED DOWN TUBE SHIFTERS SET NEW US $31.87
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 Suntour Edge 4050 Accushift 6 speed Shifters NOS downtube road bike bicycle new US $59.00
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 NOS Campagnolo Nuovo Record down tube shift levers US $60.00
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 NOS Shimano Ultegra Bar End Index Shifters8 Speed US $109.99
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can u interchange down tube shift levers designed for braze-on mounts with ones designed for clamp mounts?
i was planning on buying Shimano Downtube Shifters Triple SL-6400 (fits 5mm bolt brazeons) to replace a worn clamp-on shifter for my bike. my bike does not have a braze-on mount but does have the clamp-on mount that can house the 5mm bolt of the sl-6400.
The real question is whether or not i need the the metal bases (flat and curved) that are supplied with the new shifters as they will not fit cleanly with the clamp on mount. (im not familiar with the mechanics of the new shifter and im not sure if the bases are needed to function)
i was wondering if i can just screw the new shifter onto the clamp on mount
heres a picture of the shifter and the metal bases
http://img1.iwascoding.de/2/2008/08/14/2E3AFE35BB7C4F5E844B78094AC733A5.jpg
If I'm following you correctly, it sounds like you need to buy a new clamp mount from Shimano if they still offer those for sale. If not, you might be able to find one at http://www.biketoolsetc.com or http://www.loosescrews.com .
The little bases are necessary for the function of the shifter, so if they won't fit on the clamp you already have, you'll have to figure out something else (like a new clamp!). 
)
I fitted a few of these on older bikes and never had any trouble mounting them up using both Shimano and Suntour clamps....sorry, wish I could help you better here.