Chat with us, powered by LiveChat What Are The Differences In King Of The Hammers Race Classes | Quadratec Skip to main content
Blog

by Matt Konkle
Torque Editor-in-Chief


The vast Mojave Desert isn’t just claimed by Jeep vehicles during this year’s King of the Hammers event. There is everything from utility terrain vehicles to fully-loaded Jeeps and trucks taking on everything the desert, and surrounding rocky enclaves, can offer.

But when you look at each race during the week, you’ll see designations on vehicles that may seem strange unless you are fully indoctrinated in the Ultra4 Racing world.

So, for those who do not know, and are planning to follow along for KOTH week, here are some of the class differences you’ll need to understand.

4400: Unlimited Class

This is the original unlimited class that started the King of The Hammers years ago, and each vehicle is heavily modified and engineered to compete during the main King of The Hammers race. Drivers have to earn a spot to compete in King of The Hammers and their rides are not limited on tire size, engine or chassis design, other than to meet the safety requirements for the class. They also must have a transfer case, four-wheel-drive system and can utilize either a straight axle or independent front suspension.

4500: Modified Class

This class has been racing in ULTRA4 since 2012 and is one of the three classes that can compete during the Every Man Challenge. Currently, these do not have to qualify to race in the EMC race during KOTH week. This class is marked by vehicles that have a modified OEM Chassis or OEM Style Chassis, 2 -2.5 inch diameter shocks per corner, mechanical steering and 37-inch United States Department of Transportation approved tires.

4600: Stock Class

This class has also been racing in ULTRA4 since 2012 and is one of the classes eligible to take part in the Every Man Challenge during KOTH week. Currently, these vehicles do not have to qualify to race in the EMC. This class is marked by using a stock frame, factory engine and transmission, 35-inch DOT approved tires, 2.5-inch diameter shocks per corner and mechanical steering.

4800: Legends Class — Trophy Class

'

This class has been racing in ULTRA4 since 2014 and is one of the 3 classes eligible to race in the EMC during KOH week. These vehicles do not have to qualify to race in the EMC, and the class itself is one of the fastest-growing in ULTRA4 as older ULTRA4 cars can enter as long as they meet the requirements. Vehicles in this class can only have front-mounted engines, contain two seats side by side, utilize only a single shock per corner, use maximum 37-inch DOT non-sticky tires and only have solid axles installed.

While these classes represent the majority of full-size vehicles, KOTH week also features many UTV and full-size truck classes, including stock, pro modified, open and unlimited.

Top Jeep Articles

  • June 30, 2025
  • 4 min read
Expert Review: Quadratec Performance 3" Stainless Steel Dual Exhaust System For Jeep Gladiator JT
Upgrade your 2020–2025 Jeep Gladiator JT with a stainless steel dual exhaust system that delivers aggressive sound, improved throttle response, and head-turning style — all with easy bolt-on installation.
READ MORE
  • June 30, 2025
  • 6 min read
How To Put Bigger Tires On Your Jeep
If you have your eye on some larger tires for your vehicle, here is what you need to know.
READ MORE
  • June 27, 2025
  • 4 min read
Seven Slot Dispatch — 6.27.25
Weekly Jeep-related news items from around the industry and community.
READ MORE
  • June 25, 2025
  • 5 min read
How To Choose The Right Winch
Deciding on which winch is best for you should be more scientific than just as large as possible.
READ MORE
  • June 20, 2025
  • 4 min read
Seven Slot Dispatch — 6.20.25
Weekly Jeep-related news items from around the industry and community.
READ MORE
  • June 19, 2025
  • 4 min read
Jeep Towing Q&A
Everything Jeep Owners Need to Know About Hauling Campers, Trailers & Gear
READ MORE
  • June 16, 2025
  • 4 min read
How To Clean Your Jeep's Neoprene Seat Covers
While easy to install and remove, these comfortable protective items do need a little attention when washing to ensure a long lifespan.
READ MORE