Testing The Pro Comp Xtreme M/T Tires And Series 8128 Wheels
Beadlock wheels seem to be the trend right now, but most people don't know the hassles in dealing with changing a tire on a true beadlock wheel. If you have never done it, find someone who will let you spend a few hours removing and replacing 30-plus bolts and sealing the tire bead on their wheel. We wanted the look, not the struggle, for this project, so we called our friends at Pro Comp and got ahold of their new 8128 series wheel. This wheel is one of the best-looking simulated beadlock wheels available today. The new Tundra comes with an oversize brake package, which means you need to run an 18-inch wheel minimum to clear the calipers. We ordered our 18x8.5 8128 wheels with a bolt pattern of 5x150 mm, a 19mm offset, and 5.5-inch backspacing (PN 8128-88555). The ring is cast into the wheel when it is made as one continuous piece. The bolts are threaded into the holes that have been drilled and tapped into the wheel. A one-piece wheel ensures the wheels will take a beating and keep on spinning.
Our tire choice was the Pro Comp Xtreme M/T tire size 305/70R18 (equivalent to 35/12.50R18) because of its three-ply sidewall design and XTC rubber-compound tread. This tire has been tested on race trucks and rockcrawlers and would give us maximum puncture resistance and flexibility running both high and low air pressures in the dirt. During our testing, we ran the tires at 30, 20, and 10 psi to see how well they would fair. All pressures ran without flaw and as the pressure dropped, our traction increased. We found 15 psi to be a very happy pressure for the truck as we tackled sharp rocks and mudholes with confidence. We have a few new scrapes on the sidewalls but no tears or punctures. We purposely sideswiped a few sharp rocks to see how the sidewall protection would hold up. Not a problem. These tires rock.
Hopefully reading some of our experiences has given you the confidence to check out these parts yourself. We are very pleased with the performance of our project truck and look forward to many more weekends of fun ahead. The new 6-inch Pro Comp suspension combined with Pro Comp Xtreme M/T tires and 8128 wheels have increased our Tundra's off-road abilities while retaining a great street ride. A solid choice for consumers looking to get more out of their truck and look great doing it.
We recommend this suspension kit be installed by a professional or someone with good mechanical knowledge and experience installing suspension systems. Please consult the instruction manual included with your kit before installation.
Having access to a lift and the proper tools can make installation of a kit like this much easier. Be sure to have an extra set of hands around if you tackle it yourself. As you can see here, the guys needed to drop the front differential in order to install the new components. | 
MX-6 adjustable shocks allow you to fine-tune your rear-end performance from a more stiff ride for carrying loads or a softer feel for a more fluid feeling through the dirt. | 
The rear end utilizes a block and add-a-leaf setup to achieve 6 inches of lift. |
This is why we said this kit should be installed by a professional or someone with good mechanical knowledge. In order to allow the front driveshaft to clear a section, roughly 6 inches must be removed from the factory crossmember. |  | |