Hi. New to forum, so apologies if this has been discussed before, which I may have missed. I'm drawn to the Q45 for gravel trails such as the Katy and Erie trails. However, most of my riding is on paved rail trails. How much speed am I giving up compared to the S40? I'm hoping not much since most of the trails I ride are relatively flat. I know, the solution is to own both, but I need to start somewhere. Current ride is a Lightning Stealth. Thanks.