I have a 13 RZR 800s that has the factory ITP XCT tires. Not been happy with them. A buddy of mine has a 900 XP(not sure of the year)that is offering to sell me his factory big horns with rims.

My question is regarding sizes. From his memory he believes they are 26" tires on 14" rims. Mine are 27" tires on 12" rims. Its my understanding that these will fit on my 800s. The one inch smaller tire is where I’m concerned. I can’t afford to lose any of my ground clearance. I’ve read that the 26" big horns are actually the same size as the 27" ITPs. Any truth to this? Thought reach out to you guys for some input.
Thanks