I have 20x10x10 8 paddle haulers and a 13 tooth front, everything else is stock and it goes great in the sand for trails, ripping around and climbing.

 

I only wiegh 170 and have a 450r with an HRC kit and a pipe... I'm deffinately going to get the 20x10x8 haulers should I just stick with the stock gearing or get a 13T front sproket? Going to glamis for Thanksgiving for the 5th year!!! Duning rocks.. too bad we don't have those in Wisconsin[img]i/expressions/face-icon-small-frown.gif[/img]

 

I think with your weight, and aftermarket set up, you'd be ok with the stock gearing.
Plus Glamis is below sea level if I remember correctly.

That means you will have added power, and may even have to re-jet depending on your altitude where you normally ride.

 

Switch to a 13 tooth, you'll lose some top end but you will be quicker

 

gear calculator

check this out for tire and sprocket combos enjoy