Here's more of the story. Told my Kubota dealer that I was tired of the ruts and to get me some turfs to go on my
L5740. I didn't really care too much about the cost - $2,000++. I'd worked too hard and long getting my pastures smooth and I didn't feel like going back to rough - kidney and rib busting rough. He told me he had 2 sets in stock, but they had already been spoken for - a local golf course. So, told him to order me some - guessing I got the same. It took about 2 weeks for them to come in and I'll admit I was somewhat taken aback in their shape. Not so much with the width (wider the better), but with their height (10" smaller diameter vs stock R1's). Sure leaves an empty looking wheel-well. The lowered ride does have some benefits, though. Especially going side-to-side on a hill - cutting is much easier now (i.e., less pucker factor).
Dealer tells me these tires and rims are straight from Kubota (i.e., they're OEM). I've attached some sidewall photos showing make and size info (meaningless to me), but info appears to match some of what's in Kubota's Grand L40 brochure.
I've cut about 5Ac this weekend with the mounted turfs. Here's what I've found so far. My trenching problem is gone - big plus. Unfortunately, the ride quality of these turfs is worst than the R1's. These tires (turfs) ride the surface of the ground (flotation) and if a harden ridge is there, you will feel it - big time. First couple of passes, I was bouncing hard over the grooves made previously with my R1's. Back to the barn to let out some air. When delivered, front tires were at 30psi and rears were at 40psi. I lowered fronts to 20psi and rears to 25psi. Ride quality improve considerably with far less bounce, but I still feel the hardened ridges. The turfs didn't come loaded like my R1's - wonder if that would make a difference in the ride? Course the added weight might get me back to cutting shallow trenches again - don't want that. Will add, however, ride is smooth as silk on my roads. So will work on getting my pastures smooth again - more work unfortunately.