I will also weigh in on gearing. As it is a dedicated cross bike, I use a 12-27 in the back and a 38/44 up front. I also alternate between that and a single 42t ring in the front.
The only part I could not swap out from my older road bike was the canti brakes and pedals. For the brakes, I chose the wide profile TRP Euro X brakes which are very light, have alot of clearance room, and once adjusted properly have adequate stopping power. For pedals, I used the Crank Bros. Candy SL, which have all the mud shedding properties of the Egg Beaters with just a bit of platform for a bit of extra stability.
As for the geometry of the bike, I found it most important to focus on the standover and top tube numbers. For example, I ride a 48cm Cervelo and due to the longer top tube and stand over differences, I found the 44cm Cross Pro to fit like a glove.



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