FYI, The fastest Pro quad rider John Natalie two years ago at Unadilla had a lap time almost a full 3 seconds faster then Ricky Carmichaels lap time and the Pro quads were jumping 160-170 feet while the pro dirtbikers were jumping 130. How do I know this? Because the announcer at Unadilla came right out and said it.
The theory that bikes are faster is complete bullshit. Come ride with me and let me know if you can hang with me through the turns and shit and then see if your opinion still stands.
Dirt wheels did a Article not too long ago with a pro rider that did laps on a bone stock YFZ450 and then did laps on a bone stock YZ450F. The Quad had faster times through the turns and down the straight aways while the dirtbikes only advantage over the quad was in the whoops. The article ended up being that pretty much the quad and dirtbike 450’s had the same lap times with the same rider on both.