450s can easily crest 100+ mph, but it will leave 1st gear pretty useless. We geared ours with 15/42 for the 06 B1K and it pulled 105+ mph, but geared it down to a 15/46 for the 07 B1K to allow 1st gear to work and still get 100 mph by radar gun on the pavement.
Very Few places to go that fast now that they cut the highway speeds in Score.
That's some serious tall gearing. And horrible about race mile 340 in those rocks for the 1000. But hey... when you can reach a hundy (in a long stretch) it's a good thing. But, how often do you get there, or have the proper tire grip to reach it?! Honestly... I know bikes CAN get there... as our '05 B500 450X (the bike I now own) was geared to reach over triple digits. And honestly, it took nearly all of Ojos farm roads to get there (if it even got there during the race). Only to shut it down for the next turn. It's not a useless gearing... but it sure makes it hell for the rest of the race course and riders. Not worth it in my personal opinion. But then again, I'm not the one who manages a team or teams (maybe someday), I'm just the rider/racer guy.
We ran a 15/48 as it allowed a decent top speed, without too much rev limiter. Most 450s (stock or simply piped) have a hard time with that gearing, in my experience... (unless you speak of a TC Husky, as the gearbox is different than some of these X Hondas and the TE internal ratios and much wider - as you know) and are in a catch 22... whether they make the power to reach the intended speed (on race course, not somewhere it doesn't pertain as being a near useless point - being extreme) or your just waisting horsepower
that you'll never use. And making the lower gears so wide the bike is never in the 'sweet spot'. A hard call in theory and on the bench. However, once you do the math... you'll see the amount of time in a race, how often you reach over 90-95+... and what little amounts of gain (if any) in time that is added over the duration of miles at those speeds. Almost better to gain that time in the pits, than to try and make it up on course.
Again, every one has their thoughts on this, and respectfully... with a stock cylinder, piston, little to no mods... (overall motor being stock) it's a reach and the strain on the bike, isn't worth the few minutes or seconds in time if it even equals that much.
if rider A does 95 for 15 minutes, in an 8 hour race.... 23.75miles
And rider B does 90 for 15 minutes in an 8 hour race.... 22.5
Rider A has only gained 1 and 1/4 miles every 15min or 5 miles in an hour.
(... uhh... did the math come out right on that, it's late, and I can't see straight
... gotta hit the bed, but I think you might see where I'm going with this.
BTW, I remember Uptites 250 thumper reaching 92 with George's son on it, just before he went down. Pretty impressive if what I saw was accurate.