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Thread: Gearing ratio

  1. #1
    MoJo SuppoRteR
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    Gearing ratio

    What size rings are best? I'm going double after the triple wears out to solve the shifting problem. Currently 46-36-26. 32/11 on the cassette of 8 spd.

  2. #2
    Mojo Philomath Dave K's Avatar
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    Quote Originally Posted by Jeff
    What size rings are best? I'm going double after the triple wears out to solve the shifting problem. Currently 46-36-26. 32/11 on the cassette of 8 spd.
    I use 46/39 rings x 12/25 or 12/27 cassette. Impossible to use anything smaller than 39 with my Campy cranks, so I was limited there. But, with Shimano and FSA cranks, you can go down to 37 I believe. There are times I felt like I wanted lower gearing than that for those short, steep climbs all good CX courses have, but you really couldn't use it anyway cuz you'd lose too much momentum and would be better off dismounting and running up it. Never have wished for more than a 46 chainring though. Actually, I didn't use the big ring much except 2 courses that had a flat, paved straightaway where you could really get your speed up.

    Lots of folks just use 1 chainring thus eliminating some mechanicals, and I think you could put a bashring on then. That could be useful if you like to ride over obstacles rather than dismount.
    "The policy of the American government is to leave its citizens free, neither restraining them nor aiding them in their pursuits. ..." Thomas Jefferson

  3. #3
    MoJo SuppoRteR
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    Cool. Thanks Dave. It's doubling as a commuter so the bigring stays.
    46/39 it shall be, then.

  4. #4
    Mojo Philomath Dave K's Avatar
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    Having a little smaller chainring might be an advantage since seems like I used the lower gears of my cassette more than any other.

    FSA makes a Energy "compact" 110mm bolt pattern crank that allows a 34 small chainring. It typically comes setup as 34/50, but I've seen it listed for "cyclocross" with 34/46 or 34/48 setup for around $150. The Energy model reportedly weighs in at 600g which is about 55 grams lighter than a 39/53 Ultegra crankset, I'm sure mostly due to smaller rings. I have no idea if these cranks are any good, so please post up your opinions. It appears to be available in ISIS or Octalink, no taper-lock option.

    There is also a Carbon Compact version which saves 80 grams and costs about $250. I think I heard somewhere they have been known to creak? This seems way overkill for 'cross, but I think Tyler used them last year for the big hills of the Tour so he could stay seated on climbs and ease his collarbone a bit.

    While we're at it, I suppose you could use just about any XC crankset you like. Most don't seem to be much heavier. I favor the RaceFace Turbine taper lock. That'd be a little heavier I guess.

    Opinions/discussion anyone?
    "The policy of the American government is to leave its citizens free, neither restraining them nor aiding them in their pursuits. ..." Thomas Jefferson

  5. #5
    arrogance in the flesh Hello Kitty's Avatar
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    all you need for cross is a 42-12/27 here in texas i'm running that set up on my cross bike right now.who ever needs to shift their front in a CX race anyway?

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