Converting a Truvativ Firex Triple Crank to a Double Crank- Mtbr.com
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  1. #1
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    Converting a Truvativ Firex Triple Crank to a Double Crank

    I have a Bad Boy Ultra, I never use the granny ring so I want to take it off and use the middle and outer rings (48T-36T). What do I need to do to achieve this? Do I need a crank arm for a double set up or can I get a large metal bash guard bigger than the 48T?
    Thanks everyone.

  2. #2
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    You can just remove the ring and adjust the limit screw to prevent accidentally throwing the chain off. But other than saving a couple of ounces you haven't gained anything!
    Mountain bikers run bash guards by doing without the outer (larger) ring. I'm not aware that you can buy a bash guard for a 48 tooth ring and you can't just move your outer and middle rings across because the inner has a smaller bolt circle diameter (BCD). What you sometimes see on a hybrid is a chain protector which is often just plastic and is purely to protect your trousers.
    As an alternative you could change your cassette to a 11/26 (get a new chain too). This would remove a lot of the ratios you don't use, be a fraction lighter but more significantly give you a tighter cluster of ratios for fast road riding. If you still didn't use the granny gear you could swap out the rear derailleur for a short cage and benefit from sharper changes as well. Still short of a SystemSix but customising your bike to suit your preferences is all part of the fun.

  3. #3
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    I wished that I changed the cassette when I bought the bike to 11-26. I never use the granny ring so for ease of use I want to get rid of it (nothing to do with weight on this occasion). 48/39 seems to be the right gearing for me, with what I have read it is a cyclocross type setup.
    Last edited by mrwibble; 10-08-2008 at 12:27 PM.

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