thanks[img]i/expressions/face-icon-small-happy.gif[/img]

 

Abso-freaking-lootly!! Weight of rider, weight of bike, weight period.
I can race my buddies on identical bikes and toast em every time! I weigh 160 and they are all 190-200+.

 

I lost a bunch of weight a few years ago, and I could tell that the quad was faster!

 

The barriers to faster top speeds are drag related. Wind resistance is by far the largest type of drag that must be overcome. The rolling resistance of the tires is also a factor and that can be affected by weight. So weight could indirectly affect on top speed. But that can largely be compensated for by increasing tire air pressure to match the weight. If you weigh 300lbs then you're gonna want a few more psi in the tires vs. a 100lb'er.

If you're talking about a dramatic difference in weight (I wouldn't consider 50lbs dramatic in this context), then just make sure your tire pressure is appropriate. Given that, it's ok to ignore the affect weight has on tire rolling resistance because tire rolling resistance is grossly overshadowed by wind resistence. I don't know how the numbers would work out exactly, but I'd guess at an ATV's top speed the difference in rolling resistence created by +/- 50lbs would be a small fraction of 1% of the total drag.

Weight could affect top speed in another indirect way. If the change in weight was accompanied by a change in frontal area (i.e. bigger weight = bigger size) then you might be able to measure a difference in top speed if the change was large enough. But really, weight wouldn't be the factor at play--wind drag would be.


here's what i found, so just add more air in the tires according to him.. comments

 

<div class="FTQUOTE"><begin quote>comments </end quote></div>
You answered your own question. And correctly.
Now how fast it gets there with more weight is a different story.

 

<div class="FTQUOTE"><begin quote>Originally posted by: bigsled

The barriers to faster top speeds are drag related. Wind resistance is by far the largest type of drag that must be overcome. The rolling resistance of the tires is also a factor and that can be affected by weight. So weight could indirectly affect on top speed. But that can largely be compensated for by increasing tire air pressure to match the weight. If you weigh 300lbs then you're gonna want a few more psi in the tires vs. a 100lb'er.



If you're talking about a dramatic difference in weight (I wouldn't consider 50lbs dramatic in this context), then just make sure your tire pressure is appropriate. Given that, it's ok to ignore the affect weight has on tire rolling resistance because tire rolling resistance is grossly overshadowed by wind resistence. I don't know how the numbers would work out exactly, but I'd guess at an ATV's top speed the difference in rolling resistence created by +/- 50lbs would be a small fraction of 1% of the total drag.



Weight could affect top speed in another indirect way. If the change in weight was accompanied by a change in frontal area (i.e. bigger weight = bigger size) then you might be able to measure a difference in top speed if the change was large enough. But really, weight wouldn't be the factor at play--wind drag would be.





here's what i found, so just add more air in the tires according to him.. comments</end quote></div>

Ya It's kind of funny to see a BigFoot on a Quad.....[img]i/expressions/devil.gif[/img]

 

its liek horse racing u wanna b lighter for the machine ur ridin less stress less *** it has to move the lighter u are the better if u race u might wanna watch ur weight and diet for more speed good luck