Bike is Force 1x. What changes to fit 50/34 crank (Quarq)?
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  1. #1
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    Bike is Force 1x. What changes to fit 50/34 crank (Quarq)?

    Iíll try to explain this clearly.

    Friend offered to sell his gravel bike but itís Force 1x with 10-42t on back and Force long cage. I have Quarq power meter 50/34. If I just add crank that will give me odd gearing.

    Should I Swap cassette to 11-32 which my current bike has? Replace 34t on crank with 42t (keep 50t. I never use smaller ring on road or Tri bike)?

    Goal is being able to move my Quarq between my three bikes. I can change now in about 6 minutes. Iíve been looking at Ultegra gravel bikes because then itís easy to swap. But heís offering me a good deal to pay for new baby coming.

    Thanks for advice and suggestions.

  2. #2
    'brifter' is a lame word.
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    You have to be within the spec of the Force derailleur for both capacity and max large cog. If you have the biggest large cog it will work with you're going to exceed the capacity. Since it's designed as a 1X derailleur the capacity is 31 (42-11=31). If you have a 50-42 and an 11-32 you should be fine. 50-42=8 + 32-11=21 is 29 teeth total.
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  3. #3
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    Quote Originally Posted by cxwrench View Post
    You have to be within the spec of the Force derailleur for both capacity and max large cog. If you have the biggest large cog it will work with you're going to exceed the capacity. Since it's designed as a 1X derailleur the capacity is 31 (42-11=31). If you have a 50-42 and an 11-32 you should be fine. 50-42=8 + 32-11=21 is 29 teeth total.
    If I put the 42t on the Quarq can I just not put a FDR on the bike and keep it in the 42t for the entire time or does that create some chain line issues (using the 42t cassette)? Basically making it a 1x even though it will have the 50t on there. Does that make sense what I'm asking? lol

  4. #4
    'brifter' is a lame word.
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    Not sure, but I'd expect you'd have some issues in the smaller cogs. I don't know where the Quarq will put the chainline. The 42 single ring you have will be either 3mm or 6mm offset, I'd think the 6mm would be less problematic but I don't know what you have.
    I work for some bike racers
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  5. #5
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    Quote Originally Posted by cxwrench View Post
    Not sure, but I'd expect you'd have some issues in the smaller cogs. I don't know where the Quarq will put the chainline. The 42 single ring you have will be either 3mm or 6mm offset, I'd think the 6mm would be less problematic but I don't know what you have.
    That makes sense. Using your formula and Sheldon Brown gearing calculator, I'll play with combos as long as I'm 31 or under.

    Thanks for explaining this so well.

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