I currently have a Felt z100 and would like to get some more serious riding in and possibly race. I normally run so I might train for a small triathlon. I would like to get the Felt z6 which has a carbon frame and Shimano 105. The Z100 has an aluminum frame and Shimano Sora and weighs about 3 pounds heaver than the Z6. Is the Z6 really going to make a difference and will I go faster or am I just not a strong enough rider yet? Is the upgrade worth it?