Since I have both, I'll share what my thoughts are(R1 v R4)
I have the R1 gas on the 5410, 85HP tractor. I was going to be using it for field work, mowing and baling hay stacking big bales and I wanted the traction. Got the R1s. Got over 1000 on it now and I can say that hands down the traction is best with R1. Going through muddy areas in my trails and digging into my large sand piles it disperses the mud, dirt, gravel and allows the tires to remain free of dirt, providing continuous traction. Where they aren't so hot is on turf. NEVER take a tractor that heavy in 4x4 through a lawn. All torn up. Had a nice brown indented streak in my lawn the rest of the year. Even in 2x4 though you really have to be careful, take nice wide corners, and try not to let the tires spin or they will grab ahold of the grass and let it rip.
On the 3120, 30HP, I have the R4s. Planned to be using this a lot more on the lawns and wanted something that wasn't going to tear it up. I can say that they still aren't as good as the R3s on the lawn tractor, but are a significant improvement from R1s. As for the traction, its good, the only problem is that they clog up. If you go through mud or even enough loose dirt the tires pack up and they become even worse than turf tires. Had to use my buck and "swim" myself out of a muck hole in the woods one time. They clog up way to easy, some say that the larger (talking full sized industrial TLB's and utility) tractors don't clog up as easy, but I have no experience.
So what I say, best overall is R4, best for traction R1, best for lawn R3. But then again what did you expect?
I have the R1 gas on the 5410, 85HP tractor. I was going to be using it for field work, mowing and baling hay stacking big bales and I wanted the traction. Got the R1s. Got over 1000 on it now and I can say that hands down the traction is best with R1. Going through muddy areas in my trails and digging into my large sand piles it disperses the mud, dirt, gravel and allows the tires to remain free of dirt, providing continuous traction. Where they aren't so hot is on turf. NEVER take a tractor that heavy in 4x4 through a lawn. All torn up. Had a nice brown indented streak in my lawn the rest of the year. Even in 2x4 though you really have to be careful, take nice wide corners, and try not to let the tires spin or they will grab ahold of the grass and let it rip.
On the 3120, 30HP, I have the R4s. Planned to be using this a lot more on the lawns and wanted something that wasn't going to tear it up. I can say that they still aren't as good as the R3s on the lawn tractor, but are a significant improvement from R1s. As for the traction, its good, the only problem is that they clog up. If you go through mud or even enough loose dirt the tires pack up and they become even worse than turf tires. Had to use my buck and "swim" myself out of a muck hole in the woods one time. They clog up way to easy, some say that the larger (talking full sized industrial TLB's and utility) tractors don't clog up as easy, but I have no experience.
So what I say, best overall is R4, best for traction R1, best for lawn R3. But then again what did you expect?