Recently bought a '25 RZR Pro R 4 and everything I've done to this machine has been to prep it for these 37" Roxxzillas, I had them (35"s) on my last machine and they are unstoppable. These are the perfect tires for Utah's slickrock, sand, and desert terrain! I've never run Raceline's before, but they are what a lot of Pro's run, excellent build quality and a super thick bead lock ring. The combo looks awesome, I am looking forward to years of hard use.