Product Reviews/Trail Rides and Other Cool Stuff

Tun Ratio Background and Definition The following information is based on gear ratios from a Polaris Turbo S. Percent reduction is used to describe various gear reductions from stock ratios and can vary based on your machine.  UTV gear ratios are sometimes referred to as turn ratios. Turn Ratios are used because it is an easy way to calculate gear ratios if the gearing is unknown. For this example turn ratio=gear ratio. A turn ratio is derived from turning the rear UTV tire one turn and counting the rotations of the Driven or secondary clutch rotations in each gear. Example,...

The Polaris wheel bearing was originally designed for the old 800 RZRs which were light weight. Heavier newer machines need better bearings and that is why Polaris changed the Turbo R, Pro S and Pro R to unit bearings. I do not think an overkill bearing is bad. If you need a better bearing, put the better one in. Look how often the 3515090 Polaris bearings fail with 35s. Bearings require proper torque to set internal clearances (lash). Any bearing will fail if the nut comes loose and the internal clearance is lost. Sandcraft claims their 4x bearing is good...

A little background before we start. I have worked with a few tire companies to develop tires that you will recognize such as BFG Krawler, Mickey Thompson Baja Claw, and Maxxis Trepador. I have a test track available to test and have tested tires there that interest me. I have tested over 50 different tires. I am interested in traction on rocks and go fast handling. Here are my findings summarized below and some people may have other opinions.For hard pack/rock I find that weight has very little to do with tire performance. The tire height, air pressure, sidewall, tread...

Gear/Tire Changes vs Speed Calculations Made Simple