Tire ski jump

[Tharkûn]

I would NOT want to be one of those guys trying to slow down the tractor tire

 

[CABilly]

Gravity doesn’t discriminate between fat or slim, rich or poor, black or white, old or young, gay or straight…

I dropped out of high school physics so bear with me. I was talking about the friction of the tire. Given two objects of equal mass, wouldn't the one with less friction on the ramp (the narrower truck tire) accumulate more velocity? And isn't gravity acting on the object the cause of the motion?

 

[stangmx13]

I dropped out of high school physics so bear with me. I was talking about the friction of the tire. Given two objects of equal mass, wouldn't the one with less friction on the ramp (the narrower truck tire) accumulate more velocity? And isn't gravity acting on the object the cause of the motion?

rolling friction of a tire is more dependent on radius, weight, and stiffness of the material than it is on surface area of the contact patch or tire width. if all those 3 things were the same, yes the wider tire would have more rolling friction, but it wouldn't be by much.

 

[EastBayDave]

now lets see someone on a supermoto go down that ramp

 

[SpeedyCorky]

that was great !!!

 

[Rob]

Looks like the BFG had the best accumulative spring in it's launch, coupled with a narrow enough profile that allowed a faster speed due to less friction.