Hey, i was just wondering about my new bike i got its an 05 cannondale six13 Dura-Ace brand new and it seems when i ride it im slower and working much harder, the only idea i have is the gears are different use to ride 52-39 25-14 (junior) right now on 53-39 23-11 i am going to be getting the gears back soon also it is a bigger bike 56cm im 5ft 8-9in but i dont have to rech to the handlebars any diffrent than the bike befor?