I was wondering if anyone knew the amount of performance increase in a bike that did not have shocks vs one that does? My daughter has a Specialized Vienna that seems lite and nimble without shocks. Much faster on speed pickup especially into the wind. Its got 700 x 35 tires and does pretty good on most broken pavment etc. On gravel or any surface that is at all not hard packed it falls off quickly. I was just wondering how much energy output that shocks take away from the physical effort. The Crosstrail I ordered has a suspension lock out.