1985 Schwinn 12 speed Shimano 105 rear derailleur?
10-03-11, 06:24 AM
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1985 Schwinn 12 speed Shimano 105 rear derailleur?
I recently bought a 1985 Schwinn Traveler. Its a 12 speed, 6 rear cogs, 14T-40T. I would like to replace the existing Suntour rear derailleur with a Shimano 105. can I do it? Will it fit? What should I know? I would like to do this myself rather than LBS but feel bad asking them for their knowledge and then buying on ebay.
10-03-11, 06:48 AM
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Yes you can, if the 105 is a long cage model. You will need to use it in friction shifting. The Sun Tour is actually a better derailuer unless it is broken. I doubt the rear is 14 to 40. More likely 14 to 34. Roger
10-03-11, 09:33 AM
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If the freewheel is truly 14-40T a 105 RD isn't going to shift it. Only a few RDs will probably be able to.
If the freewheel is truly 14-40T a 105 RD isn't going to shift it. Only a few RDs will probably be able to.
10-03-11, 09:33 AM
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The Shimano road derailleurs (like 105) have a published limit on the largest sprocket- 28 teeth. In reality, you can probably go to 30 teeth without problems. 34 would be a stretch- the guide pulley will hit the sprocket teeth, and it may not even shift to a cog that big. I'd get a mountain derailleur for 32-34 tooth cogs. And I wouldn't necessarily spend the cash to go to the Deore level or above unless I were planning a 9-speed upgrade in its future. Alivio or Acera would be fine. 40 would be impossible even for mountain derailleurs.
10-03-11, 11:01 AM
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OK, a 30T cog MAY work with a 105 rear derailleur. Also, does your frame have a built in deraileur hangar or is it a separate "claw mount"?
10-03-11, 12:36 PM
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You can probably use either a long cage or a short cage rear derailleur with your double crankset and 14 - 30 cog set.
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