Introduction
Our First Off Road Tire Test
For years, we've been testing All-Terrain tires alongside the rest of the tire categories we carry, and in a similar manner. We evaluate how they feel on the road, how they handle the hard inputs and the immediate traction demands of emergency situations by pushing them on a track, testing their abilities in winter and wet conditions, and generally try to replicate what drivers experience day-to-day. Except for how they perform off-road.
Tire testing is what we do - so it certainly hasn't been for a lack of desire. We've heard the requests for dedicated off-road tire testing, and we've been talking internally about this for years. The thing is: off-road testing is notoriously difficult to do properly.
For a start, the immediate question that demands an answer is "What kind of off-road tire testing?" Literally speaking, anything not on a paved surface is off-road, from grassy fields to sand to mud to rock crawling and more. To put it mildly, there are a wide variety of differences of off-road conditions to consider and try to test for, and that's before we get into how the terrain changes with each attempt... or from day-to-day as temperatures and precipitation change. We try to control for these variables during regular testing too, but an unpaved surface offers so much more to consider, and we wanted to make sure the trust we've built up over the decades has been well-placed.
So, we've been in contact for some time with our friends and partners at the Treadwell Research Park to develop an objective, repeatable off-road tire test that we can feel good about, and we're closer now to making that happen than ever. At the same time, we wanted to get started as the off-road and 4x4 truck tire segment maintains its popularity as we get our boots figuratively dirty (and our tires literally so).
That brings us to this evaluation. This is not our typical tire test: our team looked at 3 criteria we could reasonably offer subjective thoughts on, and scouted a local(ish) place a short road trip away: the Badlands Offroad Park in Attica, Indiana. The 3 criteria we tested for are: Acceleration Traction, Steering Traction & Response, and Rear Axle Traction & Stability. We then loaded up four sets of off-road tires for our 4th Gen Toyota Tacoma test truck from the four all-terrain subcategories available for sale on tirerack.com, similar to our cross-category evaluations where the results are as much about the differences that can be seen between tire subcategories in broad strokes as they are about the individual tires.
The Details
We chose from the most popular tires in each all-terrain category to give a representative sample ranging from more on-road focused all-terrain tires to the most aggressive "mud tires" or Off-Road Maximum Traction. Each tire was mounted to our 17x8.5 Method MR703 test wheels, in size LT265/70R17 Load Range E and aired down to 20 psi.
The four tires we chose for this outing were:
- Bridgestone Dueler A/T Ascent (On-Road All-Terrain)
- BFGoodrich All-Terrain T/A KO3 (Off-Road All-Terrain)
- Nitto Ridge Grappler (Rugged All-Terrain)
- BFGoodrich Mud-Terrain T/A KM3 (Off-Road Maximum Traction)
Each one of these tires has been previously tested on the road, in the wet, dry, snow, and ice.
See those results here:
For this evaluation, we're looking at multiple types of surfaces within the Badlands Park. There are three "major" locations, with the first (what we'll call the "dunes") having sort of three separate sub-surfaces to evaluate, before moving over to the second location (the Dirt Loop), and finishing up on the Badlands' dirt field "drag strip."
The Hill Climb was just as it sounds: how far does each tire make it, given the same inputs? How does it feel? The River Rock Pit is, again, clear in its description - a large swath of loose stones that moves and shifts easily under the weight and movement of our truck.
The Sand Loop was a tilting, uneven surface resting at an angle on a large hill that provided a good additional loose surface to evaluate with a more granular texture. We moved from there to doing laps on the Dirt Loop, which presents its own unique challenges for traversal, and finally the drag strip, which is a more tightly packed dirt surface.
For the drag strip, our drivers used the manual shifting feature on the Tacoma, built to 2,000 RPM and launched multiple 0-30 runs in each direction on the strip to reduce surface variability. Results were measured in feet instead of seconds, because more distance to hit target speed meant more wheel spin, less positive interaction with the surface.
On all surfaces, we kept the Tacoma in 2WD for consistency and the broadest applicability for results. We weren't looking to evaluate the vehicle's 4WD system, and if we reference its use, that means the truck needed to be unstuck.