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  1. #1
    Dirt Huffer
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    Any big rings for 104bcd cranks?

    Im piecing together a bike and would like to utilize a mtb crankset. It's a budget build... any cheap 50t -104bcd rings?

  2. #2
    jrm
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    Dimension makes a 48T.
    Wreck the malls with cows on Harleys

  3. #3
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    An 46x11 gear is just about the same ratio as a 50x12, and is way too tall of a gear for actual CX conditions riding, more suited to a 40mph pack road sprint.

  4. #4
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    Why do you need bigger than a 36t on the front on a cx bike? Use the mtb crank with a 32 or 34 or 36, using only the middle ring as a 1x9 or 1x10. My 29er mtb has a 32 on the middle front, I rarely use the big ring, and then only on the odd fire road descents, and I haven't seen many fast fire road descents in cx Lots of fast guys use a 1x10 on their race mtn bikes with a fairly small front ring. I have 38 1x9 on my cx bike, plenty big gears, I'd run a 32 or 34 x 11-28, but the smallest ring I can get on my spider is a 38t.

  5. #5
    jrm
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    ANother thing that the Q factors going to be a bit wide. I tried this using a FSA MTB double and had to use 3 spacers on the non drive side which pushed the cranks way off center and wrecked the chainline. Now im using a converted road triple 40/28.
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  6. #6
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    The converted road triple sounds good, you could still use a short cage derailleur and 11-28?, just drop it into the 28 for the biggest climbs? For my kids next bike, a small redline conquest pro cheap from craigslist (that my wife will ride around sometimes too), I'm putting a xtr m960 crank as a double, with a 32/44, the 44 will mostly just be a chainguard, but could possibly be useful on the odd paved descent, hopefully it will line up ok. I was thinking of putting it on my bike, but it's got a Sworks carbon crank and I'm pretty happy with the current 1x9 setup. I had been eyeballing some mid 90s XT cranks I have in my shop with the same 32/44 mid and big, but the xtr is just too cool.
    A lot of the newer 2x cranks have nice ratios, a lot like the road triple jrm is using.

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