FIXING PRO XP BOTTOMING-OUT

FIXING PRO XP BOTTOMING-OUT

One of our chief complaints about the new Polaris RZR Pro XP and Pro XP four-seater is that the rear end bottoms out and scrapes the ground very unexpectedly. Our sources tell us that this machine was actually designed with 32-inch tires, but in the final hour of development, 30-inch tires were installed instead. Although our test car is equipped with on-the-fly adjustable suspension, it still bottoms out in the rear on rutted trails and when driving through G-outs. This fact kept the car from becoming UTV of the Year and from winning our shootout against the Can-Am X3. Fixing Pro XP bottoming-out is easy; here’s how it’s done.

Our chief complaint with the Pro XP is that the rear end drags the bottom often and unexpectedly in rough terrain. We increased spring preload in the rear, and it helps some but not completely.

Fixing Pro XP bottoming-out was as simple as installing a set of 32-inch-tall Toyo tires on two-piece, Metal FX Hitman, forged beadlock wheels. While you could go with any 32-inch tire mounted on the stock wheels, we like the security a beadlock provides, and the look of this wheel is on a whole new level.

We wrapped the Metal FX wheel in Toyo’s 32×9.5-15 SxS tire. It has a distinct light-truck pattern but the weight rating and thinner bead bundle of a UTV tire, so it will fit on any UTV wheel. According to Toyo, the Open Country SxS is already race proven with a win at the 2019 National Off-Road Racing Association (NORRA) Mexican 1000 by CageWrx in the Stock UTV class and an impressive performance by Team Toyo racer Bryce Menzies in Johnson Valley, California, earlier this year.

We wrapped the 32s for this test on a beautiful set of Metal FX, Hitman, two-piece spun/forged/billet beadlocks that weigh less than 20 pounds. They color-matched perfectly and didn’t widen the car any, which was the result we were after. Metal FX does have other billet and forged wheels in wider widths for the dune and show crowd. See them all at www.metalfxoffroad.com.

On the stock Pro XP, the taller 32-inch set does keep the car narrow and fast. The wheels are 6.5 inches wide and are Gunmetal Grey with Bengal Red accents, keeping them close to the stock width. The wheels also include a beadlock ring that drops down in a lip towards the center of the wheel, making installation super simple. We like the smaller 10mm bolt head as well for a slight weight savings. The wheel itself is a two-piece forged unit made of 6061 T6 aluminum. The wheel face has a textured surface and a very high-positive offset. Retail price is $587.50 per wheel.

With the 2-inch-taller tire, we did get 1-inch-more ground clearance. Our stock spring setup still puts the car at 12.5 inches of ground clearance, and now we are at 13.5 inches. The tire and wheel package goes great with the red Pro XP and looks sweet. For the test, we brought along another Pro XP that had stock tires and wheels but had upgraded tender springs installed in the rear. The springs alone did help the ride but didn’t completely cure the bottoming issues.

The Toyos provided great straight-line traction on hard and loose dirt. On a narrow car like this, we wish the tread pattern was a little more rounded so it would slide predictably. Over slow-speed rock crawling, the tires offered great grip and were predictable. For sandy terrain, you would want something a bit wider.

For 90 percent of our riding we were on the 32s, along with about 1 inch more spring preload in the rear. We did prevent the car from bottoming. We still had to hit the “full-stiff” button on occasion, and it did keep the rear from dragging.

FIX IT

For the reasons we installed these tires, they worked great. We repeatedly attacked the same G-out-filled trail that gave our stock car fits and had much better results. We couldn’t get the car to scrape the bottom. On the Comfort setting, we could feel the car run out of shock travel as expected, but it never slammed the chassis down. Our test pressure in the Toyo tires was 16 psi to give us a little room for adjustment. As it turned out, we never needed to increase or decrease pressure. The 32-inch tire did the trick. The Pro XP now hits bumps the way it should without us having to cringe in the driver’s seat. The car floats over the bumps and sucks up the G-outs like it should. If we had put a 32-inch tire on the stock 14-inch wheels, we would have had similar results, but the extra inch of sidewall surface area could have flexed just enough to bottom out or result in a sidewall puncture.

The Metal FX Forged Hitman wheel and Toyo SXS tire we chose for the experiment turned out to be the right choice. The pair will stay on this ride for a full evaluation in an upcoming issue, so stay tuned. If you can’t wait that long and want to see how cool a set of Metal FX wheels would look on your RZR, Can-Am, Yamaha, Kawasaki or any other vehicle, give Metal FX a call at (714) 891-7684. But, first pick out what style, color and size you are looking for here: www.metalfxoffroad.com. You can get Toyo SxS tires through your local dealer.

See UTV Action’s complete UTV Tire Buyer’s Guide Here: https://utvactionmag.com/10-new-tires-you-need-to-know-about/

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