I have often been tempted with this concept, and try not to blurt out my ideals (opinion) on anyone else's thread, but am interested in your opinions, especially the ones based on facts about this. In hillclimbing, and I assume drag racing, along with many other forms of racing, the rear tire is spinning the whole race. No spin, or not enough wheel spin, will hook-up and wheelie which results in the on/off throttle, or crash, and you ultimately lose against anyone who didn't crash. UNDERPOWERED or OVERGEARED
Flip side of this is too much wheel spin and your bike never accelerates, and the back end won't stay behind you.
UNDERGEARED and NO TRACTION
Many factors are involved such as soil density, moisture content, and soil composition. The tire tread pattern, condition and air pressure, Gearing Choice, Power Supply, Suspension and Riding Technique are all factors really.
Power is basically Potential Speed in my opinion. Getting it to the ground is another art, also IMO, as with this whole thread, I guess. Far from an expert here. Presently, I have a basic set-up and will alter tire pressure 3-5 lb.s either direction, or switch 2 teeth either way on the rear sprocket, shorten or lengthen rear axle adjustment.
A little less air pressure and it will hook-up a little better, more pressure, it will spin a touch easier.
Longer suspension will help keep the front wheel down and help give a little wheel spin, shorter then would help give some traction to the ground ( I never try to shorten up a stock length bike)
2 teeth less on the rear and the bike is noticeably hooking up better, 2 more teeth and you will come out of any load sensitive bog and/or wheelie. (1 tooth bigger on the front is close to changing to three less on the back sprocket and vice versa, and is even more noticeable change than two teeth on the rear)
Suspension adjustments are aimed at keeping the rear tire putting power to the ground. Bumpy terrain needs a faster suspension and a big jump might need to be stiffer and slow to rebound. Suspension is an adjustment that I really need advice on. I usually leave it alone because of my ignorance of input and response with the adjustments to conditions, especially how it relates to the short hills that I race. The write-up by Paul, the former Administrator, about Race Sag and Static Sag really helped get the spring right and that made me alot faster. Thanks for that Paul.