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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 07-09-12, 05:54 AM   #1
Dalai
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CX bike sizing compared to road bike?

I'm looking at buying a CX bike to race - and have found a CX bike for a great price but it is smaller than my road bike. I have been trying to find information here how a CX frame should compare to a road fit and it appears you want to go down a size for racing. Is this correct?

Comparison of the geometry of my road bike (120mm stem, saddle nose 5cm behind BB, BB to saddle top 77cm, 175 cranks) and CX bike (not sure of stem or crank length).

........................ CX........road
size.................... 55......... 56
seat tube ct.......... 540...... 540
tt horizontal........... 537...... 550
seat angle ........... 74.58....74
chainstay length...... 422..... 405
front centre........... 594..... 590
ht length.............. 115..... 157

Thanks
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Old 07-09-12, 07:14 AM   #2
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Not necessarily, no. The fit of a cyclocross bike is going to be a tad different than that from a road bike. Typically, you ride in a slightly more relaxed posture on a CX frame, as opposed to a very "efficient" tuck on a road bike, though a CX frame is extremely flexible in allowing you to configure your components in order to chose your riding position. My experience has been that the size of a CX frame correlates well to that of a road bike. I ride a 56cm in both frames. I tried various CX frames in 55cm, but they felt small and off balance to my body built for any spirited riding.

Last edited by WolfsBane; 07-09-12 at 07:18 AM.
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Old 07-09-12, 08:33 AM   #3
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+1 to WolfsBane's post.

IMO the ideal setup for CX is identical stack and reach as your road bike, then flip the stem up.

A couple of quirks perpetuate the "size down your frame" myth. In order to have enough tire clearance in rear without lengthening the chainstays too much, most CX bikes have a slightly steeper seat tube, which shortens the top tube. Similar in front: longer fork means shorter headtube.
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Old 07-09-12, 05:24 PM   #4
Dalai
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I'm organising to check it this weekend and will measure the stack and reach and see if it is close enough...

Thanks for the replies!
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