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Why is my does chain collasp when I pedal backwards?(6 posts)

Why is my does chain collasp when I pedal backwards?mawat67
Apr 28, 2001 7:17 PM
Unless I am pedaling (forward) my chain slaps the frame. If I just coast or pedal backward to align my feet for a dismount, my chain just sits there. I rarely will allow me to pedal backward. If I have the bike upside down, the does not occur. I have a Trek 1000. Any help or direction on what is causing this and how I can adjust fix it would be helpful.
Mark in NC
re: Why is my does chain collasp when I pedal backwards?fuzzybunnies
Apr 28, 2001 7:54 PM
Sounds like you have too much friction in the free wheel mechanism which won't allow the cassette to back spin and catches so the cassette spins while coasting. Try to get some lube into the free wheel mech to free it up. TTFN
One possibility is misalligned dropout.Scy
Apr 28, 2001 8:09 PM
The exact same thing happened to me. It turned out that the rear dropout was misaligned causing the pulleys on the rear derailer to tilt inwards towards the wheel. Just take a look; the two pulleys should be in a fairly straight line with the rear cog that you're in. I simply took off the rear derailer and used an adjustable crescent wrench to align the rear dropout.

Please note, I had a steel frame. If you Trek is aluminum, you could snap off the rear dropout using this method.
Oops, I meant derailer hanger, NOT rear dropout (NM)Scy
Apr 28, 2001 8:12 PM
nm
re: Why is my does chain collasp when I pedal backwards?Dave Hickey
Apr 29, 2001 3:53 AM
When its happened to me, it was the freehub needing lubrication. Take off the rear wheel and spin the cassette. If it does not spin freely, it needs lubricaion.
Had the same problem....Bruce Garrett
Apr 29, 2001 4:43 AM
...on a friends bike. The tension and guide pulleys did not turn freely. We took them apart, cleaned and relubed and that fixed it.