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King of The Hammers Ultra4 Vehicle Classes

Posted in News on January 30, 2018
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In order to compete in an ULTRA4 event like the King of the Hammers race happening in Johnson Valley, California, next week, teams have to follow a strict set of rules and pass a rigorous ULTRA4 tech and chassis inspection. It takes a lot of time, dedication, and skilled team members to build and maintain a vehicle that performs at the ULTRA4 class level. ULTRA4 racing classes include the 4400 ULTRA4 Unlimited Class, the 4500 Rubicon Express Modified Class, the 4700 Spec Class, and the 4800 Legends Class – Trophy Class. In addition to 4x4s, the series also features two UTV classes, the UTV Pro Class and the UTV Sportsman Trophy Class. We’ll be livestreaming the King of the Hammers race from our website so be sure to check out Fourwheeler.com for all the latest during the race next week.

4400: ULTRA4 Unlimited Class
The 4400 class is the original unlimited vehicle category, following the same guidelines as the vehicles that drove the original KOH race. In order to qualify for the 4400 King of the Hammers race you must either finish in the top 20 at KOH the previous year or be one of the top-10 non-qualified drivers at regionals and nationals.

Class Characteristics:
The 4400 class doesn’t limit tire size, engine size, or chassis design, and the only requirement other than safety requirements is four-wheel drive. Both IFS and solid-axle 4x4s are allowed.

4500: Rubicon Express Modified Class
An ULTRA4 class since 2012, the 4500 class competes during the Smittybilt Every Man Challenge; however, they do not have to qualify to compete.

Class Characteristics:
• Modified OEM Chassis or OEM Style Chassis
• 2–2.5 inch diameter shocks per corner
• Mechanical Steering
• 37-inch DOT-approved tires

4600: Pro Comp Stock Class
Also competing in ULTRA4 since 2012, the 4600 Pro Comp Stock Class competes in the Every Man Challenge and does not have to qualify to race during KOH week either.

Class Characteristics:
• Stock OEM Frame
• Factory Engine
• Factory Transmission
• 35-inch DOT-approved tires
• Single 2.5-inch–diameter shocks per corner
• Mechanical Steering

4700: Spec Class (Western Series Only)
Since 2014, the 4700 Spec Class has been competing in the Smittybilt Every Man Challenge. In this class there are six identical 4x4s that teams can rent from ULTRA4 for the event. Like the other classes these vehicles do not have to qualify to compete in the Every Man Challenge.

Class Characteristics:
• Chassis has the look of a classic JK but is fully equipped with top aftermarket parts, including:
• Mopar Hemi 5.7 Motor
• Fox Racing Shox
• Dynomax Exhaust
• Spidertrax Axles & Housings
• Yukon Dropouts & Lockers

4800: Legends Class – Trophy Class
Also an ULTRA4 competition class since 2014, the 4800 class is one of the fastest growing ULTRA4 classes, partly because older ULTRA4 cars are allowed to enter as long as they meet the requirements. This class costs less to enter because unlike the other classes, 4800 class teams compete for trophies rather than purse money. Like the others though, vehicles in class don’t have to qualify to compete in the Every Man Challenge.

Class Characteristics:
• Front-mounted engines only
• Vehicle must contain two seats side by side
• Single shock per corner
• Max 37-inch DOT-approved non-sticky tires
• Only solid axles allowed (not IFS or TTB)

UTV Pro
The UTV Pro class has been competing during KOH week since 2009, making it the second oldest ULTRA4 class. This class races for a cash prize and usually competes on Wednesday of KOH week.

Class Characteristics:
• Must be 1000 cc or less
• Vehicle must have a 6-point aftermarket cage
• Belts must be 5-point harness
• Additional tech and safety requirements apply

UTV Sportsman: Trophy Class
This class is for drivers who want to experience KOH at a sportsman level. This class only races for trophies rather than for cash like the UTV Pro level.

Class Characteristics:
• Must be 1000 cc or less
• Vehicle must have a 4-point aftermarket cage used in conjunction with aftermarket rear bracing to create a 6-point cage
• Belts may be 4-point harnesses
• Additional tech and safety requirements apply

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