I'm surprised people are talking about "wheelies" for the reason sleds have been using larger and larger rear wheels.
"What about the claim that ALPHA ONE is more efficient than traditional systems?
The larger 10-inch rear idler wheels on ALPHA ONE are more efficient, with less loss of power. When measured, ALPHA ONE delivers an efficiency that translates into a 3- to 5-horsepower advantage."
http://www.arcticinsider.com/Article/The-FAQs-on-ALPHA-ONE
"What about the claim that ALPHA ONE is more efficient than traditional systems?
The larger 10-inch rear idler wheels on ALPHA ONE are more efficient, with less loss of power. When measured, ALPHA ONE delivers an efficiency that translates into a 3- to 5-horsepower advantage."
http://www.arcticinsider.com/Article/The-FAQs-on-ALPHA-ONE