Cyclocross bike sizing

[Leah]

I am buyig a cyclocross bike! I've read that you should buy cyclocross bikes a size or two smaller than a road bike. Is there any truth to this?
If anyone has any recommendations or comments or possible cx bikes for sale, let me know!

[Josh Whitmore]

The whole thing of getting a size smaller is a bit misleading and out dated. Generally, most people are more comfortable on a cross bike with their handlebar a little closer and a little higher compared to the ideal position on a road bike. 10-15 years ago (or before) when this mantra came into style, cross bikes were sized identical to road bikes of the time. Modern cross bikes however are usually have a bit shorter top tube compared to the same size in a road model. For instance, I have specialized road bikes and cross bikes. My road bike (size 56) has a TT of 56.5 and my cross bike (size 56) has a TT of 56 even.

The important things in setting up your cross bike position are 1. Saddle position will be identical to your road bike (height and setback) 2. Handlebar in a place where you have good control and balance on the bike in technical sections (usually closer and higher than a road bike where a more aggressive bent over position is favored for aerodynamics).

The other complicating factor is that different brands will measure bikes differently. One brand's 54cm might not be the same size as another brand's 54cm. They key is to look at the horizontal or (virtual) top tube length. These measurements should be comparable between brands. When shopping for a cross bike, look for a bike that has a slightly shorter horizontal top tube than your road bike. You can fine tune the length and height with the stem.

I do have one of my 56cm specialized cross bikes for sale, frame only for $400 or the complete bike for $1800.

I hope that helps!

[Leah]

Thanks Josh! Cyclocross season... here I come!!

[mvi]

For what its worth: you can ride your road-or mountainbike very effectively in a cross (definitely in beginners class). No need to spend a lot of money too soon. A certain Murphy rider (now Sylva?) won the first Cat 1/2 race in Johnson City last year on his MTB. Got some free cross tires for you if you need them.

[Leah]

I got an old Bianchi (its going to double as a commuter, I've heard horror stories about stolen bikes at OSU, I say a little prayer for my road bike everytime I lock it up there)! I'm thinking its a '96 or so. Needs some cleaning up, but can't wait to start riding and racing! Maybe I'll do a race in NC when I'm home for break.

Thanks again for everyone's help. And Kansas is just a hop, skip, and a jump away so maybe I can come cheer on anyone who goes to nationals.