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  1. #1
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    Help me choose Cyclocross bike size based on road bike size.

    I tried searching - couldn't find much. Sorry if this is an often asked question.

    I'm looking to get a cyclocross bike on the cheap (i.e. used) and thus don't want to waste a shops time asking fit questions and trying out stuff since I don't intend to buy there. I figure I can get into the ballpark based on my road bike size/geometry. What I'm not really sure is the cross riding position (I'm a noob to cross, looking to get started).

    I currently ride a Cervelo S2, 56cm bike with a stack of 560mm and reach of 394 mm (i'm 6-1 for reference). It's very aggressive with a lot of drop for me, with a few spacers and a 110 stem. I also ride an older Bianchi steel frame in 57 (stack and reach unknown) with a 110.

    I'm looking at a Specialized Tri cross in 58 that is stack of 611.7mm and reach 382mm. So it's 5 cm taller (though I use spacers on the Cervelo) and about 1 cm shorter. Should that be in the ballpark of the right size/position for me? Obviously, there is adjustability in stem length/angle and spacers.

    Thanks.

  2. #2
    All Bikes All The Time Sawtooth's Avatar
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    Although many chose to go down a size, both of my crossers are 54, just like my Tarmac. Although I do race occaisionally, I use them for a lot of things other than cross racing so I like my fit to be perhaps a bit more stretched out than your average cross racer. I tend to like my top tubes on my cross bikes to be about the same length as my road bikes. My crossers even feel a bit larger than my road bike but I am fine with that.

  3. #3
    Have bike, will travel Barrettscv's Avatar
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    Quote Originally Posted by Jsiegs View Post
    I tried searching - couldn't find much. Sorry if this is an often asked question.

    I'm looking to get a cyclocross bike on the cheap (i.e. used) and thus don't want to waste a shops time asking fit questions and trying out stuff since I don't intend to buy there. I figure I can get into the ballpark based on my road bike size/geometry. What I'm not really sure is the cross riding position (I'm a noob to cross, looking to get started).

    I currently ride a Cervelo S2, 56cm bike with a stack of 560mm and reach of 394 mm (i'm 6-1 for reference). It's very aggressive with a lot of drop for me, with a few spacers and a 110 stem. I also ride an older Bianchi steel frame in 57 (stack and reach unknown) with a 110.

    I'm looking at a Specialized Tri cross in 58 that is stack of 611.7mm and reach 382mm. So it's 5 cm taller (though I use spacers on the Cervelo) and about 1 cm shorter. Should that be in the ballpark of the right size/position for me? Obviously, there is adjustability in stem length/angle and spacers.

    Thanks.
    I would use reach as your best guide. I'm 6'0" and ride a 60cm size.
    When I ride my bike I feel free and happy and strong. 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.

  4. #4
    All Bikes All The Time Sawtooth's Avatar
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    Update, I just completed my 14 mile commute in to work on my JTS. I noticed that the reach on the JTS feels significantly shorter than it does on my Major Jake. The only real difference is in the handle bar. I am running an FSA pro-wing compact on my JTS and a Ritchey WCS ergo on my Major Jake. The reach to the hoods and in the drops is SIGNIFICANTLY greater with the Ritchey ergo bar. I say this because it is something to consider...even with a relatively limited frame (as long as it is within a decent range of fit), you have a lot of sizing variables for adjustment with components as well.

  5. #5
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    I'll go the opposite of conventional wisdom: my roadie is smaller than my CX.

    I bought my 57cm CX (Felt F1X) w/o having much of a clue about what size I was. Picked up a 56/54cm (top tube/seat tube) Cannondale R800 for a quick road bike.

    Both work. Since the road bike is smaller, it feels even quicker to handle. I put a short (85mm) stem on the CX and it feels fine.

    I ride almost exclusively on the tops, not on the hoods or drops. Cross-top brake levers essential for riding in traffic (Seattle). I even put 'em on the roadie.

  6. #6
    coprolite fietsbob's Avatar
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    you building a Cross race bike or just a commuter on a cross bike platform?

  7. #7
    Senior Member
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    Quote Originally Posted by fietsbob View Post
    you building a Cross race bike or just a commuter on a cross bike platform?
    I plan to race.

  8. #8
    Senior Member
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    For reference, I'm 6'0 - I ride a 56cm S1 (same geometry as your s2) with a 110 stem. I ride a 57cm Felt F75x with a 90mm stem. The reach (measured) is identical they way they are set up, but the cross bike definitely feels bigger. In retrospect, I would have been better off with a 55cm cross bike.

    Tricross tends to fit big in my opinion. My first bike was a 58cm Tricross and it was way too big for me. The long chain stays make it feel even more sluggish compared to the bikes I own now. If you're looking at getting into racing, I'd looking into something a little more aggressive than Tricross.

  9. #9
    coprolite fietsbob's Avatar
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    Simon Burney, UK Coach to the young Pros, whose Books on the subject of cyclocross,
    are in their 3rd edition,
    says take off a CM from seat tube length and reach. to the bars..

  10. #10
    Senior Member Abu Jack's Avatar
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    I bought a Motobecane Fantom Cross last year in the same size as my speciaized roubaix. It fit fine. I'm very happy with the fit.http://www.bikesdirect.com/products/...ross_ti_xi.htm

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