• Jan 8th 2008 at 7:43PM
  • 56
Well, there's another embargo blown. HUMMERForums dropped all the images they had of the HUMMER HX concept that was due to be officially unveiled in a scant five days, and Jalopnik followed suit. So here it is, HUMMER's Wrangler-competitor in concept form, complete with a 3.6-liter SIDI E85 FlexFuel engine which sends power to all four wheels via a six-speed auto 'box. The HX is technically a convertible, meaning that the roof panels and modular rear can open or be stowed, while the interior instruments can be reconfigured depending on the type of driving you'll be doing. All the details are available in the press release after the jump.



  • Youthful, open-air entry-level-size HUMMER
  • Designed by a trio of young designers
  • Convertible body with removable roof panels and modular rear roof assembly
  • Easily removable fender flares and doors
  • Full-time 4WD with front and rear locking differentials
  • Aeronautically inspired interior with functional, lightweight design elements
  • Reconfigurable instruments for highway and off-road driving
  • 3.6L SIDI V-6 E85 FlexFuel engine with six-speed automatic transmission

DETROIT – With its unmistakable HUMMER design and a compact, go-anywhere driving ethic, the HUMMER HX concept challenges the hierarchy of the trail. HUMMER displayed the nimble, reconfigurable off-roader at the 2008 North American International Auto Show.

More compact than a HUMMER H3 – 81 inches (2,057 mm) wide, with a 103-inch wheelbase (2,616-mm) – the HX concept is an open-air, two-door off-road vehicle that packs the off-road acumen for which HUMMER has become legendary, along with an easily convertible body that acclimates to varied trail conditions, cargo needs or passenger whims. Its design is based on the ideas developed by a trio of young designers who are new to the HUMMER studio.

"The HX is HUMMER's vision an agile, trail-ready, open-air vehicle that fits the lifestyles of everyone who needs or wants to drive off road," said Martin Walsh, HUMMER general manager. "Of course, it carries exceptional off-road capability and the distinctive styling for which all HUMMERs are known."

The HX offers an open-air driving experience via a pair of removable roof panels above the driver and front passenger, and a modular, removable rear roof assembly. With the roof panels and roof assembly removed, the HX is transformed into a true convertible.

Easy removal of the roof panels and rear-roof assembly enables quick conversion from a closed vehicle to an open one. The HX also was designed with several roof assemblies, allowing this versatile vehicle to be configured as an SUT (with the roof assembly removed), a stylish slant-back or a traditional, wagon-like design that offers a bit more cargo space.

The HX was shown with a slant-back configuration, wearing a desert-inspired matte olive paint scheme, at the North American International Auto Show. Additional convertible features include:

  • Removable doors – easily removable pins in the exposed hinges allow the doors to be removed quickly – an appreciated feature of many serious off-roaders
  • Removable fender flares – attached with quarter-turn quick-release fasteners, the composite fender flares can be quickly removed for additional trail/rock clearance, or if the flare is damaged during off-road driving

"The modular design of the roof and removable body panels mark an evolution of HUMMER's design aesthetic," said Carl Zipfel, director of design. "These features demonstrate a deeper understanding of enthusiast desires when it comes to off-road driving – and the slant-back design gives the HX a look all its own."

Purposeful exterior

The design of the HX was driven by input from three young designers who were new to GM and the HUMMER design studio. As part of their "initiation," they were charged with developing concept drawings for a smaller, youthful HUMMER and the HX is a direct result of their creativity. The HX concept is based on one of the designers' original illustrations, but incorporates the best ideas and elements from the other designs.

"HUMMER appeals to young people globally and served as a perfect first assignment for our newest talent," said Ed Welburn, vice president, Global Design. "Today's graduates from top design schools are ready to hit the ground running. The HUMMER design challenge gave our newest designers an opportunity to sprint."

Inside and out, the HX carries a purposeful aesthetic that, from initial sketches to finalized clay models, was refined in only six months.

"This is the HUMMER design language stripped down to its essence," said David Rojas, creative designer. "The HX has an aggressive appearance and great proportions, with beauty lying in its functional austerity."

On the exterior, the lightweight theme is evidenced in the appearance of exposed, billet aluminum suspension components that feature CNC-machined lightening relieves, as well as clean, unadorned bodywork and minimal trim. The lightweight theme is taken to its extreme when the roof panels, roof assembly, fender flares and doors are removed.

Classic HUMMER design cues make the HX instantly recognizable, including the round headlamps located in square housings, an upright windshield profile, minimal overhangs, hood vents and prominent air intakes. The air intakes are functional and feed a V-6 engine beneath the hood, while the hood vents are active – they articulate to allow hot underhood air to escape.

And while the headlamps and grille are clearly HUMMER cues, they've evolved on the HX with a "chopped circle" motif. The grille slots and headlamps, as well as elements on the interior, have the appearance of circles or ovals that have been clipped at the top and bottom, creating a unique appearance that speaks to the vehicle's purposeful aesthetic.

"The 'cut-off' circles suggest larger, heavy-duty components that were trimmed to fit the compact HX," said Rojas.

And while it is unadorned by extraneous embellishments, the HX's exterior is nonetheless outfitted with features that speak to HUMMER's legacy of technology and innovation, including HID headlamps with focusing rings that adjust automatically when they're turned on – much like the lens of an auto-focus SLR-type camera. LED technology is used for the front turn signal lamps and taillamps.

Aeronautically inspired interior

From aircraft-inspired seats to integrated, off-road-ready tools, the HUMMER HX's interior has a beauty that lies in its purposeful intent. It was inspired by the functional and lightweight elements found in aircraft.

"Aeronautical parts are designed to be both lightweight and strong, and that is the feeling exuded by the HX's cabin," said Stuart Norris, interior design manager. "There isn't superfluous trim or decoration – it is a purposeful design that conveys beauty through strength."

Reinforcing the stripped-to-the-essence feel, the exterior's matte olive color carries over onto the interior's largely sheet metal-covered panels. The color is accented with pressed or extruded aluminum components, such as the handles, switches and other necessary parts.

Furthering the aeronautical influence is the instrument panel, which uses an exposed, extruded aluminum cross-vehicle beam as its foundation. On the beam, the instrument cluster and other vital controls are mounted; and it also features a unique, removal top cover that provides significant storage capability.

"The instrument panel is a styling element of the HX, and the removal of the top cover reveals a secondary design that enhances the vehicle's core design ethic," said Norris. "With the top cover removed, the interior conveys even more of a basic essence – and the structure beneath the cover is beautiful to those who appreciate finely crafted metal."

A rubberized floor and ballistic nylon-material covering on the instrument panel and other interior components reinforces the functional aesthetic.

Seating and console details

Like aircraft seats, the HX's seats are constructed on a lightweight framework with minimal components that feature lightening holes and strength-enhancing cross braces or triangulations. They are mounted on exposed, aircraft-style tracks and trimmed with a weather-resistant neoprene material.

The HX seats four, with a pair of bucket-type seats in the second row. The rear seats mimic the front seats' design and can be removed to generate more cargo room. All the seats feature a four-point, racing-style safety harness.

The inner seat track on both front seats is located beneath the outer edges of a prominent center console. The console offers exceptional storage capability and houses a unique shifter that mounts low and out of the way when the vehicle is parked – also hiding from sight the engine starter button. It has a spring-loaded cover that pops up when the driver is ready to select a gear.

The console also houses a resting place for phones, MP3 player and iPods or iPhones. In fact, there is no conventional radio in the HX, only integrated speakers. Passengers plug in an iPod, or similar device, to a USB connector to play music in the HX.

"From the console to the cargo area behind the seats, there are simply untold storage possibilities within the HX," said Norris. "It's like a four-wheel backpack that's already fitted with the necessities."

Gauges and tools

The "cut-off circles" motif of the exterior is seen even more so on the HX's interior, as the gauge cluster, instrument panel vents and even the steering wheel carry the design element.

A three-element gauge cluster – each of the three instrument "pods" carries the cut-off circle design – delivers crucial driver information in either a highway or off-road mode. This conceptual reconfigurable gauge layout uses LCD screens with multiple layouts, including a navigation system. The nav system features GPS and compass information; and is designed to upload trail information before setting off on an excursion.

The center gauge pod houses a speedometer and tachometer, but changes to a wheel angle indicator when the transmission is in the low position. This off-road mode changeover from the highway mode gives the driver information that is more pertinent to the driver conditions. The trail view of a camera mounted in the rear-view mirror can be displayed on the instrument panel, too.

The off-road mode features of the instrument panel comprise the virtual tools of the HX, while others are mounted for physical use, including a folding shovel, flashlight and first-aid kit. They all carry the "clipped circle" design motif found throughout the vehicle.

Ready for rocks, trails and more

With its compact dimensions, almost no overhangs and grippy 35-inch tires, the HX is ready for all terrains. Like all HUMMER production models, the HX has sturdy, body-on-frame construction, onto which is mounted front and rear independent suspensions.

The front suspension features an electronic-disconnecting stabilizer bar for enhanced maneuverability when driving off road, and the rear suspension is located with CNC-machined, billet trailing arms. Heavy-duty shocks with piggyback reservoirs were custom-made for the HX by renowned racing shock manufacturer Fox; one is mounted at each wheel position.

A full-time 4WD system pulls the HX over, through and around off-road obstacles. It transfers torque to the front and rear axles, each of which is equipped with a locking differential. The torque meets the trail via custom 35-inch-tall off-road tires that are mounted on a set of custom, bead-lock-style wheels that have a two-tone appearance; dark-painted wheel centers complemented by silver-anodized outer rims.

A complete underbody armor kit, including a front skid plate, powetrain protection and more, protects the HX from wayward rocks and other potentially damaging objects. A power-operated winch is located in the front bumper, and the HX has recovery hooks mounted on the front and rear bumpers, just in case its help is required for wrangling others out of unfortunate off-road situations.

Motivation for the HX comes from an E85 FlexFuel 3.6L SIDI V-6 that is backed by a six-speed automatic transmission. The transmission is teamed with the 4WD system to offer exceptional low-speed traction and crawling capability. Four-wheel-disc brakes provide confident stopping power.




Body style / driveline:

two-door, four-seat open-top, four wheel-drive


welded steel frame, electro galvanized steel

Engine type:

3.6L V-6 VVT (variable valve timing) with spark-ignition, direct injection

Displacement (cu in / cc):

217 / 3564

Bore & stroke (in / mm):

3.70 x 3.37 / 94 x 85.6

Block material:

sand-cast aluminum with cast-in bore liners

Cylinder head material:

cast aluminum


DOHC, 4 valves per cylinder, variable valve timing (VVT)

Fuel delivery:

direct high-pressure fuel injection

Compression ratio:


Horsepower (hp / kW @ rpm):

304 / 227 @ 6300 rpm (est)

Torque (lb.-ft. / Nm @ rpm):

273 / 370 @ 5200 rpm (est)

Fuel Type:

unleaded regular or E85 ethanol


Hydra-Matic 6L50 six-speed electronically control automatic transmission


front: independent SLA, custom Fox Racing coil-over shocks; 2-in shocks, 2.5-in springs

rear: semi-trailing link, custom Fox Racing coil-over shocks; 2-in shocks, 2.5-in springs

Wheel travel (in / mm):

front: 9 / 228
rear: 11/ 279


four-wheel disc; Brembo 6-piston calipers (front); Brembo 4-piston calipers (rear)

Rotor diameter x thickness (in / mm):

15 x 1.25 / 381 x 31.75

Wheel size & type:

20-inch x 9-inch


35-inch custom Bridgestone Dueler

Wheelbase (in / mm):

103 / 2616

Overall length:

171 / 4343

Overall width (in / mm):

81 / 2057

Overall height (in / mm):

72 / 1829

Track (in / mm):

67 / 1702 (front); 68 / 1727 (rear)

Minimum ground clearance front (in / mm):

13 / 320

Approach angle (degrees):


Departure angle (degrees):


Breakover angle (degrees):


Grade capability (percent):


Side slope capability (percent):


Water fording capability (in / mm):

24 / 610 (at 5 mph)

Seating capacity:


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    • 1 Second Ago
      • 7 Years Ago
      I like it. Finally a worthy GM replacement to the old two-door blazers we all used to use for off-roading. It even has the removable top like my old blazer. I do agree though that it needs a small diesel. That's one thing the Jeep wranglers don't have that would get a lot of jeep buyers to notice this "Hummer wrangler". The low end torque of a small modern diesel would be immense, perfect for crawling.

      The only thing that gets me though is the independant suspension front and rear. For off-roading I'd take solid front and rear axels anyday. I guess they want it to be more nimble on-road. It doesn't really matter though, companies already sell solid axel kits for all the other Hummers, so I'm sure they can make kits for this one.

      By the way, I'm glad to see Hummer making smaller vehicles. If they can keep this under 4,000lbs it should be quick, nimble, and a solid off-roader. With a small modern V6 and six speed auto, gas mileage and emmissions should be better than most other mid-size and full size SUVs and trucks GM is putting out right now.
      • 7 Years Ago
      I was just at the Chicago Auto show. The HX was the most exciting vehicle at the show, hands down. I would ordinarily never consider a Hummer, but this vehicle is a reasonable size, gets to the heart of adventure, plus adds some practicality. The HX is just the right size for people who want to have some fun, but also need to haul a few things things around. About the only thing I would add is the ability to fold the seats down in such a way so that you could sleep in it if needed, also some sort of optional, but integrated roof rack system would be nice. For me, the HX comes close to combining a Jeep, an Isuzu Vehicross and perhaps a little Honda Element thrown in. The more "Swiss Army" features that can be designed into this vehicle the better, that way we can use it for work as well as just fun. Oh, btw, please design the rear gate to open down flat so that it can be used as a work surface.
      • 7 Years Ago
      me thinks these designers spent way too much time playing HALO... all it's missing is the Master Chief and a gun turret.

      I like the overall appearance of the vehicle though and look forward to hopefully seeing it on the highway with a turbo diesel 4 instead of the V6.
        • 7 Years Ago
        Your right! Remove the roof and this is a warthog! I wonder if it is able to drive off 500 foot cliffs and take direct rocket hits like the warthog can?
      • 7 Years Ago
      It looks ok and all, but I'd still take a Wrangler over it any day of the week. No solid axle's suck, even the FJ has a solid rear. I buy a 4X4 to go off-roading, not to look good and be stylish; that's what I have the Vette for.
      • 7 Years Ago
      What an unmitigated piece of automotive trash. Just when I thought that we had already reached the peak of GM's complete cluelessness and idiocy they bring out yet another worthless concept. Of course GM are good for only that. They still haven't a clue how to make vehicles that people actually want. You GM fanboys amaze me, if they launched an elephant turd on four wheels you guys would think it will put everyone to shame. GM is a dead man walking but soon it will fall down. I cannot think of a car company more deserving of the fate it's heading for.
      • 7 Years Ago
      Ok I have to say other then it being a complete waste of materials i did have a good laugh at the removeanble doors point simply because i can take the doors off my car to... does that make it an off roader lol
      • 7 Years Ago
      Say what you want, I think the design is pretty cool looking in that "ruggedly refined" way. Drop a diesel in it to make it fuel efficient and let the market determine if it's viable or not.
        • 7 Years Ago
        great argument Paul. guess what? i'm not saying we can all walk or ride a bike to work. America is made of suburbs, we need cars when motorcycles aren't logical. (i do ride a motorcycle that returns 50+ mpg when weather permits). I'm saying that you don't need to commute in a hummer, or a yukon (how many of those do you see on construction sites?), or a denali, or an escalade, or an expedition.
        it's about doing what you can as an individual within reason. yes we need construction equipment and yes we need tractor trailors, no one is arguing that point...so what is your point Paul?
        • 7 Years Ago
        Actually, I see a lot of Hummers, Yukons, Denalis, ect at construction sites. Usually these are owned by the engineers, foreman, owners, ect who need a vehicle that can function like a truck (go offroad and carry their tools and surveying equipment), but also needs to be luxurious for when they need to entertain clients, make business deals, and other wise need to look presentable. Now a days you're just as likely to see someone floating around a construction suit in a suit and tie as you are someone in overalls.

        My point was, construction equipment hasn't really changed much in 100 years. Catalytic converters just became standard within the past year or so on construction equipment. If one really wants to make a difference they should rally to make that stuff cleaner. A hummer is a drop in the bucket compared to a lot of other things out there. It's just an easy target for a environmentalists, who probably wouldn't be happy even if everyone was driving around in 3cyl Geo Metros.

        Personally, I'll continue to drive large cars, trucks and suvs, not just because I like them and they're what I grew up with, but because I find them to be very useful (even after owning smaller vehicles). Apparently I'm not the only one since, IIRC, 8 out of the 10 best selling vehicles in the US are large cars, trucks, and suvs. With 1/2 ton trucks in the #1 and #2 spot. Most people aren't going to spend $30,000+ on a truck if they don't see it as being worth it.
      • 7 Years Ago
      I hate to drag out this never-ending debate on SUV's but here goes...

      People argue that the market needs all kinds of cars...ok.

      People argue that they should be able to buy whatever they want because it doesn't affect anyone else...wrong.

      guess what? people who drive small cars go more miles on less gas.
      people who drive SUV's and HUMMERS go less miles on more gas. want to argue with that?

      You driving your HUMMER costs everyone money. Thanks very much.

      0h, and by the way. you might as well peel that american flag/support our troops sticker right off your big, jacked-up bumper because you're not doing our soldiers any favors.

      If you want to drive a HUMMER, move to Dubai. Maybe there the masses won't ridicule you. They'll thank you for helping to take America's money.

        • 7 Years Ago
        and guess what? people who drive motorcycles go more miles on less gas than people who drive small cars. and people who drive mopeds go farther on less gas than those who drive motorcycles. and people who use bicycles are greener than those who use mopeds. and people who walk are greener still. Fact is, there are plenty of people out there who get around just fine without a car. How bad a vehicle is for the environment is a relative term. For most people owning any kind of car is a luxury more than an absolute necessity.

        Personally, Hummers don't bother me in the least. I work in the construction field and see big diesel trucks, as well as diesel and gas heavy equipment, who burn hundreds of gallons of fuel a day (with black smoke billowing out from their 10+ Liter engines). Compared to a tractor trailer a hummer is as green as a prius, and there's a hell of a lot more tractor trailers on the road than hummers, running a lot more miles. It could always be a lot worse. Driving around in a new hummer is a lot better than driving around in an old pickup truck in a bad state of disrepair, yet the Hummer a more visible scapegoat, so people can jump on the bandwagon. Kill the Hummer and people will find something else to complain about.
      • 7 Years Ago
      Jablonski did the Interior Rojas did the Exterior. Kang didn't do anything onthe Show vehicle.
      • 7 Years Ago
      That concept is so sweet looking! I was really wondering how they would pull off a two door hummer. Looks like they found a way!
      • 7 Years Ago
      Since everyones going crazy over gas it seems fitting hummer should come out with something smaller...i dunno about the 300hp v6 but maybe something more tame for production. I like it and is BA enough to make ppl stray away from the H2 possibly
      • 7 Years Ago
      Ive never been a fan of Hummers, but that does look rather B-A. Like hammer down through the desert kinda way.
        • 7 Years Ago
        Agreed. Simply the best looking Hummer. Ever. Its most definantly the only product they've come out with (and I realize it isnt in production yet) that I'd actually considor buying.

        Its not that I'm anti-SUV, either, its just that so far their products just didnt appeal to me whatsoever.
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