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  1. #1
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    Cyclocross crank recommendations

    After reading this:

    http://cowbell.cxmagazine.com/forum/...age=2#comments

    I am inspired to try a double chain-ring setup with one of these combos: 34/42, 38/48, 36/46, 38/44.

    Can I swap chain-rings on my stock road Shimano 105 (Hollowtech 1) cranksets; or will I need a "compact" type crank?

    If new cranks are needed, any recommendations?

  2. #2
    Riding like its 1990 thenomad's Avatar
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    If you have a 130 bcd crank with 39/53 then your only options on a smaller ring are 38.
    If you want to go smaller then yes, you will need a 110 bcd crank which is typically found on compacts with 34/50. Then you'll be able to run the smaller sizes.
    If you are on a budget then you can just find smaller chainrings from 38-48 with 130 bcd size.
    My blog about rides, bikes and builds: ridesgoneby.blogspot.com

  3. #3
    coprolite fietsbob's Avatar
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    some courses , the double is not required.. then a 42t will be fine..

    130bcd, a 38/46 should be a consideration..

    running the hills. riding the flats..

    Just road riding , on a cross bike, would be different..
    34-50 is a road combination..

  4. #4
    Team Beer Cynikal's Avatar
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    As noted in the CX forum, different regions (or conditions) require different ratios. I'm in Norcal and our races are typically drier so I use my big ring a fair amount (46). If you are in the northwest then you will have a different set up than if you were in Arizona. Find a local shop that caters to cross and ask the locals what they are racing or go to a clinic in a few months and see what everyone else has.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

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    Thanks guys, VA/ MD & PA cross events can have some decent hills. Is it possible to rum a 38 with a larger cassette in the rear (like 30 or 32)?

  6. #6
    Team Beer Cynikal's Avatar
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    I use a standard crank (130 bcd) with a 12-28 cassette. With this set up, any hill that I would need smaller gearing I should be running anyway. Most CX races don't have long climbs, just shorter run-ups.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

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    One last question, If I normally run 180mm crank arms for road (I have a 35 in inseam w/ barefeet) should I drop back to 175mm cranks for cyclo-cross?

  8. #8
    coprolite fietsbob's Avatar
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    175 is Certainly more common length.. do you dig a pedal into the up hill side
    riding off camber sections?

  9. #9
    Team Beer Cynikal's Avatar
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    I would say 175's just for the ease of getting them. Are you getting new cranks or pulling from the parts bin?
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

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    Likely getting new BB30 compact cranks.

    Quote Originally Posted by Cynikal View Post
    I would say 175's just for the ease of getting them. Are you getting new cranks or pulling from the parts bin?

  11. #11
    Team Beer Cynikal's Avatar
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    Just did a quick search for a 180mm compact (or standard) BB30 crank and only found that Zipp does them. Maybe you've had better luck. All that being said, I think you'll be fine with 175. I ride everything from 165 to 175 and don't notice much of a difference.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

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    thanks

  13. #13
    Cardiac Case Drag's Avatar
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    Sorry for bringing up an older thread.

    I'm considering getting my first CX bike. As far as crank arm length for your CX bike goes, do you guys typically use the same crank arm length as on your road bike?
    TITANIUMDIVISION
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  14. #14
    or tarckeemoon, depending marqueemoon's Avatar
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    I use 172.5 for both cross and road.

    I find a standard crank to be fine for cross, but a standard sized big ring is going to useless for a cross race, and replacing the big ring with something usable is going to have to be part of your budget. I'm using a Thorne 44t big ring. I basically use it for starts and pancake flat courses and the rest of the time I'm in the 39.

  15. #15
    Team Beer Cynikal's Avatar
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    I also run the same as my road bike.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  16. #16
    idc
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    I have 170mm cranks on all bikes. My road is a 50/34 and CX is a 46/36.

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