Flex Rocks & Rollovers Co-Drives with PGR for 2023 KOH

King of hammers is the world’s most gruesome single day race known to date. What better way to battle amongst the best with Flex Rocks and Rollovers by our side! For years Proving Grounds Racing had been cultivating a relationship with Marvin Stammel, owner, and creator for the thrill-seeking enthusiast centerfold of off-road. This time we put Marvin and his team in with the big leagues, Hammers style!

Racing with Proving Grounds in the Miller Motorsports Pro Chassis 4415, Marvin will co-dog with John as they fight tooth and nail for victory on the lakebed this 2023.

This is where you click to not miss a beat!