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  1. #1
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    Compact to cyclocross crank?

    I have a Shimano compact crank (50/34) and was curious if I could change the rings for a more cross-style gearing (46/36) while maintaining the same crank. Is this possible? I wasn't sure with the different ring sizes

  2. #2
    Have bike, will travel Barrettscv's Avatar
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    You should change both rings for best results. Aftermarket chainrings are so overpriced that a new crank can be cheaper. You should be able to sell your compact on fleabay to reduce your investment.
    When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

  3. #3
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    I actually just had the opposite done. I bought a Cannondale CAADx Ultegra Disc. I had them change the small chainring from a 36 to a 34. I now have 46/34 because I need the granny climbing gears as I'm primarily using the bike on the road. It works like a champ.
    Last edited by Sportster2009; 03-12-14 at 03:02 PM.
    2013 Cannondale CAADX Ultegra Disc
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  4. #4
    Senior Member User1's Avatar
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    46/34 sounds sweet! Can someone give an idea of what the range is on the two rings? That type of info is not really that easy to find. I have to rely on retailers for a clue!

  5. #5
    Have bike, will travel Barrettscv's Avatar
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    Use this tool to calculate all kinds of data for your drivetrain: Mike Sherman's Bicycle Gear Calculator
    When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

  6. #6
    Team Water Andy_K's Avatar
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    Price may be the thing that kills the OP's plan (or at least makes it painful). For Shimano rings (as an example) it looks like the cost is around $80 for the pair. I got a CX50 crankset from Jenson USA for that cost not long ago.

    On the other hand, switching to 46-34, which is what I'm running on my CX bike for gravel grinding rides, is cheap. You can get and Ultegra 34T ring for around $12.

    I would expect that the market for lightly used rings is pretty good, but they might be generally worthless enough that you have to send out a WTB message to get them. I know I've got a pile of chainrings in my garage at any given time.

  7. #7
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    Both sets of those rings should be 110 BCD and can interchange at will.
    I've changed both my CX bikes from 46/36 to 46/34.
    If you think you might be changing back and forth, just buy rings.
    If not, swapping cranks might be easier.
    I've found used rings for ~$20 or so on EBay and various forums.

    I've got the two 36t FSA rings that are both lightly used.
    I would easily let one go for $20 or other items of need of similar value.
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  8. #8
    Senior Member User1's Avatar
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    Quote Originally Posted by Rumpled View Post
    I've found used rings for ~$20 or so on EBay and various forums.
    Wait, you're buying stuff on forums??? Which ones? I've been looking for frame and or a CX bike for ages! So far my sources has been CL, sometimes coast to coast, and ebay.

  9. #9
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    Slowtwitch.com has a very active classified forum. (Triathlete forum) Got shifters, a tribelt and cranks there.
    EBay got CX frame, stem, seat post, pedals,,34t ring.
    CL for an Ultegra wheel, bars and saddle.
    Brakes from a member of a group on FB.
    Derailleurs I bought new online, they are pretty cheap on EBay.

    All but the frame and derailleurs were very budget priced.

    Took many hours of searching over a couple of months.

    Still looking for more Ultegra wheels and repair stand and a garmin.
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  10. #10
    Senior Member User1's Avatar
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    Quote Originally Posted by Rumpled View Post
    Slowtwitch.com has a very active classified forum.
    Slowtwitch looks pretty good. I'll keep an eye there. I'm up on my local CL here. One thing I forgot to mention was REI used gear sales are pretty good sometimes. I've gotten parts there. I picked up a returned Feedback stand for $75 that ain't bad at all. I've yet to use it, but I do have 3 bikes I have to build up.

  11. #11
    coprolite fietsbob's Avatar
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    Out of the box , manufacturers choose for you , 36-46 is common ..

    already got a 110bcd crank? get 2 chainrings of your choice for the course.

  12. #12
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    I scope Slowtwitch from time to time as well. I bought a couple really nice ultegra cassette's on there shipped for $45, I'm going to use them on some Tubeless wheelsets (some day in the fall when I get these bikes paid up).

    Chainlove (timed deal site) is a hit or miss site, but I picked up two pairs of 2013 Aksium wheelsets (with tubes and tires) shipped for like $360. (gearscan website is a decent way to track it)

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