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Old 04-06-11, 10:54 AM   #1
bobbyj
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Downtube Shifters

Hi,

I recently bought a trek 710 and the down tube shifters seem to be a little worn out. Any suggestions on new ones? Where would i buy them?

Thanks
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Old 04-06-11, 11:03 AM   #2
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are they 6 or 7 spd? scrounge your LBS no telling what you can find there, then the sale and trade forums here finally ebay. I have had good luck using some Sachs index shifters on a bike with Sante

OH do you shimano or Suntour?
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Old 04-06-11, 11:14 AM   #3
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its actually a 3x5 spd (3 in front, 5 in back). To be honest, shimano or suntour would work for me.
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Old 04-06-11, 11:28 AM   #4
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In that case you could use any downtube shifter that has a friction mode.

If you can't find a new one check for the vintage bike items for sale and check with the local bike shops that have been around for enough years to have a good supply of old bits. Even a stem mount cluster can often have the shifters removed and they will fit onto the square lugs of your downtube.

The shifters have a tension adjustment screw as well. Have you tried tightening that up to see if you can generate a little more drag tension?
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Old 04-06-11, 11:49 AM   #5
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Look at an old LBS they normally have parts from old bike in bins also try the local bike co-op
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Old 04-06-11, 12:23 PM   #6
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LooseScrews.com is another source.
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Old 04-06-11, 01:41 PM   #7
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Thanks for the advice. One thing that I did notice on my bike is that, when the left shifter is fully engadged, the gear does not change to 1st gear on the 3spd pedal gears. It doesn't line up basically. What can I do? Let me know if this does not make sense
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Old 04-06-11, 01:49 PM   #8
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OK what kind of bike is this and how long have oyu owned it? has it been tuned recently? perhaps you just need to properly adjust the derailleurs n the shifters themselves.

dependig on the type of shifter you can take them apart and clean them. do you need a shifter with a clamp?
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Old 04-06-11, 02:03 PM   #9
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its a 1981 trek 710. I just bought the bike from someone on Craigslist. He said he had the bike serviced, but im not sure if i believe him. Im not sure what you mean by the "shifter with a clamp"..

Do i need to take it to take it to a bike shop of can i clean/ adjust it myself?
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Old 04-06-11, 02:14 PM   #10
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You can do it yourself. Check Sheldon Brown's site, or Park Tools also has an excellent series of articles on doing things. It sounds like you need to adjust the front derailleur at a minimum. Might want to clean it as well. Are you saying it will not shift to the largest (outside) chainring, or to the smallest (inside) chainring?
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Old 04-06-11, 02:21 PM   #11
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Sounds like your derailers are out of adjustment. New shifters will not fix this problem. Read: http://www.sheldonbrown.com/derailer-adjustment.html and other articles on Sheldon's site to get it figured out.
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Old 04-06-11, 02:26 PM   #12
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You can do it yourself. Check Sheldon Brown's site, or Park Tools also has an excellent series of articles on doing things. It sounds like you need to adjust the front derailleur at a minimum. Might want to clean it as well. Are you saying it will not shift to the largest (outside) chainring, or to the smallest (inside) chainring?
It will not shift to the smallest (inside) chainring
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Old 04-06-11, 02:29 PM   #13
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It will not shift to the smallest (inside) chainring
Two possibilities: 1) Cable tension is too tight. 2) Lower limit screw is turned in too much.
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Old 04-06-11, 03:03 PM   #14
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It will not shift to the smallest (inside) chainring
Follow the step by step instructions on the Park Tool site for adjusting a front derailleur. If you are uncomfortable doing it, just take it to a shop, its a cheap fix.

Note, don't waste time if the cables are rusty or housings are worn. Replace them first, they are consumable parts (parts that are expected to wear out).
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Old 04-09-11, 11:55 AM   #15
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Follow the step by step instructions on the Park Tool site for adjusting a front derailleur. If you are uncomfortable doing it, just take it to a shop, its a cheap fix.

Note, don't waste time if the cables are rusty or housings are worn. Replace them first, they are consumable parts (parts that are expected to wear out).
So upon trying tto fix this issue I uncovered another issue that may be the root cause of the shifter problem. The crank or out gear seem to be bent. What I mean by bent is that, for example, if I set the pedal at 0degrees the outer gear does not touch the chain, but when rotate it 180 degrees the outer gear touches the chain. Do I need to get a nnew gear or crank? Can I do it or should I take it to a shop?
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Old 04-09-11, 12:45 PM   #16
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A chainring that spins with a wobble is a tricky one to solve. Generally crash damage will bend the crank arm in, it wont affect the rings. How much wobble do you have (mm side to side).
Downtube shifters really dont wear out. Dissassemble the shifter. Maintain the order of all parts by threading onto chord or wire. Photograph the dissassembly as you go.
Clean the parts in solvent. Use a bit of grease on the threads BUT dont use grease on the friction rotating parts or they wont stay in gear.
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