Modeling time 1hr, render 1hr 52mins.
Colour change in Photoshop.
Sonix.
Sleek design Sonix :o Those shaders of yours always work some wonders too.
The background texture is a little large and strong, but not even that can really compete with the terrific curvature present here 
My favorite is the middle one since it seems to strike the best contrast.
RobertT
Whoa. Ease up on the chrome there. Turn it down a notch or two.
Also the ground texture is a bit too contrast to the render.
But other than that, great modelling.
love the bike. nice design… any chance of a rider?
delt0r
I agree with Robertt here. The ground texture is really distracting and doesn’t fit the over scene at all. I know it’s a speed model, but a different one would definitely be better suited.
Looks like you have some serious AA jaggies in these renders too.
Great design though. Not that it would be a very comfortable ride, but it sure looks fast as hell. 
BgDM