I have a 18 speed mountain bike. (Huffy)

I recently had my rear derailleur replaced along with new shifters.

Shifting in the lower gears is smooth and there is no noise when pedaling.

However, when I am in the upper gears, there is a "clicking" sound.

What adjustment can I make to eliminate that sound?

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  • 1
    Sorry to ask, but is it just me or there are only 6 cogs in the back? Are you sure it's a 21 speed drivetrain?
    – Robert
    Commented Sep 7, 2019 at 4:17
  • 1
    A mismatch between the shifters and the number of cogs in the cassette/freewheel would definitely cause this kind of behaviour where it's in tune at one end of the range but not at the other end of the range
    – Kibbee
    Commented Sep 7, 2019 at 11:40
  • @Robert Lee You are right. I have edited my post.
    – fixit7
    Commented Sep 7, 2019 at 17:01
  • 2
    I have sent a message to the bike tech based on this info I have received. NO! If you have an INDEXED SIX-SPEED freewheel or cassette and you want to keep it indexed then you need a SIX-SPEED shifter. 7 speed and 6 speed are different thicknesses of cogs and spacing between cogs is different too.
    – fixit7
    Commented Sep 9, 2019 at 21:18
  • 1
    I do have an indexed shifter. The bike tech offered me either a 6 speed shifter or a 7 gear freewheel at no charge. I am going with the freewheel since it will give me 3 more gears.
    – fixit7
    Commented Sep 10, 2019 at 14:29


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