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First Look: Yokohama Geolandar X-MT G005 Extreme Mud-Terrain Tire

Posted in How To: Wheels Tires on June 13, 2018
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Photographers: Yokohama Tire

If you have been following what Yokohama Tire has been up to, you would have noticed that the company has introduced some incredible new products for the off-road world. Last year, the company brought out the all-new Geolandar M/T G003. Earlier this year, Yokohama developed a sticky Geolandar M/T R-Spec compound Ultra4 race tire, and now the company has pulled out all the stops with the all-new, ultra-aggressive Geolandar X-MT extreme mud-terrain tire. But don’t let the name fool you. It’s not just for mud. In fact, the company is said to have designed the Geolandar X-MT for a variety of terrains, including street, rocks, mud, and more. And Yokohama isn’t even close to done yet. The company plans to develop an entire line of X-series extreme tires for each of the current off-road–worthy tire models, the X-MT being the most aggressive of the bunch.

The Geolandar X-MT G005 looks much different than the standard Geolandar M/T G003 mud-terrain tire, which offers a glimpse of just how serious Yokohama is about offering extreme versions of each tire model. You’ll notice the massive voids between the tread lugs first. It’s likely one of the most aggressive-looking radial tires currently available. The tread design is reminiscent of the Yokohama Mud Digger, which was phased out more than two decades ago for a milder tread pattern. Most off-roaders will appreciate the aggressive sidewall tread of the new tire, which is helpful in loose soils and when climbing obstacles at precarious angles. The siping in the lugs and already mentioned voids should have no problem pumping water away from the tread on wet surfaces to avoid hydroplaning.

The tread pattern of the new Yokohama Geolandar X-MT is extremely aggressive and similar to the Yokohama Mud Digger from decades past. The large, chunky lugs gnaw for traction on loose terrain and sharp, jagged rock faces.

When developing the X-MT, Yokohama used the popular BFGoodrich Krawler KX, Mickey Thompson Baja Claw, and Nitto Mud Grappler for performance comparisons. The X-MT tread design is said to be inspired by naturally jagged extreme terrain. Every X-MT tire size comes with the Geo-Shield three-ply polyester sidewall. The tread area is protected with three polyester plies, two steel plies, and a full nylon cover ply. There are also extra cap plies on the tread edges and thick, meaty sidewall lugs to fend off punctures. A high-density triple-polymer blend is used in the tire tread, while the luggy tread blocks are said to be optimized to provide extreme off-road traction, superior crawling, and self-cleaning capabilities. The Geolandar X-MT is said to match popular mud tires’ performance in wet road conditions, braking, and off-road, while increasing mileage and decreasing noise, weight, and rolling resistance. Yokohama claims that the X-MT’s mud performance is 6-10 percent better than a Nitto Mud Grappler and 4-8 percent better than a BFG Krawler.

The Yokohama Geolandar X-MT is available in ten sizes ranging from 35 to 40 inches in diameter for 17- to 20-inch wheels. A 40x15.50R22, a 38x13.50R24, and a 40x15.50R24 will be available in late 2018, and a 42x14.50R20 is planned for 2019. The company will also apply its proven sticky race tread compound to the X-MT tire, although availability will be extremely limited.

We spent the better part of a day punishing a set of 40x13.50R17 Yokohama Geolandar X-MT tires from behind the wheel of a heavily modified Jeep JK in abusive, rocky terrain. Our tires were aired down to 8 psi, but as they warmed up in the summer sun they hit the low teens. The massive open voids in the tread give the tire the ability to grip in loose terrain and provide forward movement. These voids also help the chunky tread lugs cling to sharp rocky edges like a mountain climber’s fingers and hands. At first, we were a little concerned that the empty space between the tread lugs would offer an easier place for a puncture to occur, but the tire has a sturdy carcass and there is a sort of “skirt” feature that increases the carcass thickness around the base of each lug. None of our tires received a puncture wound. Despite the aggressive tread, our aired-down tires had no problem staying on top of deep sand and offered paddle-like traction climbing dunes. Unfortunately, there is not much rain or mud in the California deserts in the summer and we didn’t get a chance to run the X-MT down the highway, but we will get our hands on a set of the new Yokohama tires and put them through the wringer. Stay tuned for a full long-term test in an upcoming issue of Four Wheeler.

All 10 current sizes of the Geolandar X-MT feature a three-ply sidewall. The large sidewall lugs help to improve traction and puncture resistance.
A closer look at the tread lugs and open voids reveals a raised skirt around each tread block. That extra rubber and sturdy carcass should help fend off punctures in the open void area.
Extra material is added to the sidewall to create a rim protector. Even thick beadlock rings will be well hidden from trail obstacles.
With tire pressures in and near the single digits, the tread of the 40x13.50R17 tires on our JK had no problem bending around obstacles. The sidewalls bulged nicely to provide a smooth ride, a larger contact patch, and more flotation.
Loose, rocky hillclimbs posed no challenge for the Yokohama X-MT. The aggressive tread gripped anything in its path and didn’t dig down or lose traction.
Throwing big V-8 power at the Geolandar X-MT in the sand provided paddle-like traction. The flexible aired-down carcass offered plenty of flotation to stay on top of the soft stuff.
If you frequent the rocks, you’ll appreciate the three-ply Geo-Shield sidewalls on the X-MT. We didn’t notice any cuts or chunking after a full day of abuse from a 5,600-pound Jeep.

Specifications (as tested)

Tire: Yokohama Geolandar X-MT G005
Size: 40x13.50R17LT
Type: Radial extreme mud terrain
Load range: D
Max load (lb): 3,195
Sidewall construction: 3-ply polyester
Tread construction: 3-ply polyester, 2-ply steel, 1-ply nylon
Approved rim width (in): 8.5-11.0
Tread depth (in): 21/32
Section width (in): 14.2
Tread width (in): 11.1
Overall diameter (in): 39.7
Maximum psi: 50
Weight (lb): 93.6


Yokohama Tire

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