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  1. #1
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    help with changing gearing on diamondback cobra 20

    I bought a Diamondback Cobra 20 for my 6 year old boy. He has recently started hitting the trails with me but has a hard time getting up some of the hills. I was looking at putting a 32 front chainring on and a 14-34 cassette on the rear. My question is which cassette would I be able to swap it out with? And would I have to change the derailleur as well? His cassette is the Shimano ZT-20 Thanks in advance

  2. #2
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    "TZ20 6spd 14-28t Freewheel"
    His bike doesn't have a cassette, it's a freewheel.
    To install a cassette, you will have to replace either the hub or the entire wheel.

    The TZ20 is available in a 34t model
    https://www.biketiresdirect.com/prod...peed-freewheel

  3. #3
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    Awesome Thanks for the help Am I gonna need the park tool as well? And will I need anything else to switch everything? Sorry for all the questions im still learning all this

  4. #4
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    You will need Park Tool FR‑1.2

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