• How reliable are those cheap thumbshifters?

  • Surprisingly so, I have used a 3 speed one for an 8 speed drivetrain and they work really well.

    The only problem is that because it made almost entirely out of plastic, it cannot be guarantee it will work for a while, nor if it's fixable.

  • Its only a backup. I had that exact £7 Shimano one on a bike for years and it was fine (admittedly it was my front shifter). Still got it somewhere and last I checked it worked fine.

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