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Probable derailleur problems

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jljack13 Offline
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Posts: 1
Joined: Oct 2013
Post: #1
Probable derailleur problems
Hello, I recently purchased a western flyer freestyle 10 speed road bike for super cheap ($5) off the internet but now Im fixing it up to make it road ready and keep running into problems. The one i am particularly having trouble with is the rear derailleur, which is a Shimano positron II. It seems like the derailleur does not have to pull to pull the chain back into riding (have not actually ridden it due to safety concerns but moved the petals) resulting in extra slack. also only one of the pulleys actually touches the chain. Can I fix this or do i need to purchase a new one if so which one I am wanting to keep cost as low as possible just looking to be able to travel ~10 miles on roads at a decent speed. Would this one work: http://www.nashbar.com/bikes/Product_10053_10052_533510_-1___202435
Oct 3, 2013 10:27 PM
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1FJEF Offline
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Northern Mexico (Central CA)
Posts: 651
Joined: May 2011
Post: #2
RE: Probable derailleur problems
(Oct 3, 2013 10:27 PM)jljack13 Wrote:  Shimano positron II. It seems like the derailleur does not have to pull to pull the chain back into riding (have not actually ridden it due to safety concerns but moved the petals) resulting in extra slack. also only one of the pulleys actually touches the chain.
You have typing or translation errors, so I don't understand the questions, but it sounds like the chain is routed incorrectly. Also that is not a cheap rear derailleur (RD), you can find them for half that, but we need a clear picture of the RD & RD hanger so we can tell what will fit, & if a short cage is OK.
Oct 4, 2013 05:54 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,520
Joined: Jul 2010
Post: #3
RE: Probable derailleur problems
This one will work:
http://www.amazon.com/Shimano-Tourney-TX35-Derailleur-Speed/dp/B003ZMH69S/

But; you may need different shifters.

Nigel
Oct 4, 2013 09:30 AM
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DaveM Online
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Posts: 1,423
Joined: Aug 2008
Post: #4
RE: Probable derailleur problems
(Oct 4, 2013 09:30 AM)nfmisso Wrote:  But; you may need different shifters.

If it's a "Positron" system, you'll definitely need a new cable, maybe shifters. The positron systems don't rely as much on the back pull of the spring in the derailleur to pull it in to higher gears. You "push" the derailleur with the shifter which is why they use a solid, wire like gear cable instead of a normal one. I've never tried a positron shifter with a normal der, but it might work.
Oct 4, 2013 09:39 AM
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