RZR XP 4 1000 Rzr XP4K Tire sizes December 7, 2015 I have a 2014 1000XP 4 seater. What is the biggest tire I can run without modifying or adding a lift of any kind ? Thinking about going up a size or two from the stock 29" tires. But not sure what will fit and not scrub in tight situations. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related