Quote Originally Posted by madison View Post
hey I was wondering if anybody could help me? Im trying to work out the difference between all the cyclocross bike gears some have shimano tiagro and some have shimano 105,what do they all mean? i understand that some a more racy gears where as some are more built for hills, I want a bike that can go really fast and allow me to get up hills ok. At the moment I ride a basic mountain bike (no susp.) and can cycle up any hill without stopping but I would like to go faster on the flat,thanks alot
I think you also might be asking about the differences in the components. All the information everyone provided above works for ALL bikes. All of those gears are available in Tiagra and 105. Those are just different names of models. The 105 is a higher-end system, but with the same gears. It's just a little lighter and more durable. Shimano ranges from the low-end (cheaper, heavier) Tiagra to the highest end Dura-Ace (light, and VERY expensive!). It goes Tiagra, 105, Ultegra, and then Dura-Ace, being the very best in the Shimano line.

Hope that helps!