My bike gears keep shifting late, and going out of gear?

  • Thread starter Thread starter alongfortheride
  • Start date Start date
A

alongfortheride

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I just bought a used TREK 830 mountain bike with a shimano 21 speed. It rides alright, but the only problem is somtimes when shifting (paddle shifter) it takes some gear grinding to shift into gear. Also when I stand up to pedal hard the bike goes out of gear and into another gear. How do I fix this?
 
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