About Us

ULTRA4 Racing is the official web site of Hammerking Productions. The founders of Hammerking are the force behind the toughest one-day off-road race on the planet: King of The Hammers.  

King of The Hammers takes place each year in February, on public lands in Johnson Valley, CA.  The race has evolved from 12 teams racing for bragging rights and a case of beer, to more than 300 teams competing before more than 35,000 fans in person and nearly 500,000 watching online. Due to the incredible success of King of the Hammers, and to give these cars and their drivers a chance to showcase their unique capabilities, Hammerking has formed the ULTRA4 Racing series.

The series challenges drivers to compete in a wide variety of terrain from endurance desert racing to competition-style rock crawls to short course racing. ULTRA4 Racing currently has 8 races throughout the United States and ULTRA4 Europe currently has 4 races throughout Europe and plans to expand in the future. 

If you have any questions regarding ULTRA4  Europe, please contact [email protected]

Maxxis King of Britain
Kirton, UK

2/10/2017 Driver Update - Click here for 2017 King of Britain Driver Packet

We are excited to announce that the site for this year’s KOB has changed to Kirton Off Road Centre.  It is never our desire to change a venue once the schedule is set, however, due to unforeseen circumstances our booking with Bovington was unexpectedly cancelled by the site. Kirton is the original location for the short-course Rampage races held on a small portion of the terrain available for competition. We plan to use the entire site at Kirton to build a course worthy of the ULTRA4 Europe finale. The Euro Trial recently took place at Kirton and provides a fitting example of the technical terrain available at this location.  Chris Bowler has already begun working his magic on a brilliant course and rest assured, there will be rocks.

We had booked our 2017 dates with Bovington shortly after the successful 2016 event. However, Bovington recently was forced to cancel the booking due to unexpected military training exercises scheduled for that same weekend.

The date of the event has not changed, and Kirton offers ideal ULTRA4 terrain in a location where fuel, food and restaurants are all within 5 minutes of the site.

Address: Kirton Off Road Centre, Gainsthorpe Rd E, Hibaldstow, Gainsborough DN21 4JL
Host Hotel: Forest Pines, Ermine St, Broughton, Brigg DN20 0AQ. Tel: +44 (0)1652 650770 Quote Ultra4 Europe to get discounted rate.

During the event there will be a food tent and bar on site.

For travel planning purposes use postcode DN21 4JL.