No, there from a T1510 NH. I fell for the R-4 hype. I'm going to turf tires.... again.
I know everyone has different needs and uses, but I'm kinda sorry I went the R-4 way.
I mow approx 3 acres with it. Plus, I move snow. I have a 3pt blower and loader. The R-4's are murder MY turf, not to mention I think the turfs are better in snow. My ground is heavy, and takes a while to dry after a rain, or snow melt, as this spring seems to serve us. I realize turfs are kinda useless in deep mud, but I really don't log with it. I can always take one of the bigger ones. I know everyone has different needs and uses, but I'm kinda sorry I went the R-4 way.
I find myself in the same boat. Currently watching for a set of turfs to show up (used) and try to snag them. I've found the R4's to be pretty good in snow, so I'll probably keep them....but for mowing I've got to get something not as rough on my lawn. BTW, I passed on a set of turfs and wheels last fall that were listed for $850. Turns out to have been a mistake to not grab them.