When I pedal backwards on my bike, why do the gears get messed up?

Mr.Goldenmatt

New member
Hello. When I'm riding downhill on my mountain bike with 21 speeds, the pedals move forwards, and when I pedal backwards the chain doesn't move smoothly at all through the rear derailleur and often gets stuck. If I just keep my feet still the same thing happens as when I pedal backwards. It is a brand new bike right out of the box and as soon as I rode it for the first time, It was messed up.
Thanks for the help, It means a lot!
 
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