It seems like this gets brought up every race. The 250's are almost, or sometimes even faster than the 450's. I think what gets forgotten a lot of times is that on a 250 you are able to dominate the bike and attack the track. It's you and the bike vs the track. A 450 is a rodeo bull, always trying to spit you off. On a 450 its you vs the bike and the track. It takes a lot more skill and endurance to ride the big bike at the same speed.
I was just showing that the speed differences are about the same across several riders and not just the top 1 or 2 ... Yep those 250 4t are fast... But I would't say it is rider vs the 450 ... These guys are PROs .. not the same crowd we see on the trails or tracks we ride on ... Endurance is nothing that can't be built up ... I don't remember RC or JS slowing down at the end of races due to fatigue ... I'd think with all things equal, the track plays a big part ... If that 450 can't use its HP advantage and that 250 is allowed to carry its speed around most of the corners ... More CCs ain't gonna help ...