My previous tractors had R1 tires, and I was always impressed by the mud I could churn through. They were still slippery in icy conditions though. My current tractors have R4 and turfs. The switch to R4s for me came after I moved to a property that was higher and much drier than my previous place. And I went with R4 because that’s what was on the tractor at the dealers lot. There is only one spot that stays wet for any time on my property and it’s at the very back. So I can stay away from it and I’m not worried about mud very often. The turfs are honestly my first choice in snow. Having R4s on the front has been great for running around with a full loader. I’ve even roaded full buckets of dirt in high range without concern. They are much sturdier than my previous R1s. But the R1s on the rear don’t provide any advantage that I can see. I miss the traction that I used to get in two wheel drive with my previous tractors. With R4s I’m engaging the FWA a lot more often than I did previously. So I’m finding that increases the tire wear enough that I’m probably not gonna get as much extra life out of my front R4s as I expected. My perfect tire setup would be R1 in the back with an R4 style front tire. But that would take a lot of math to get right, and tires are too expensive to get it wrong. So I stick with the what I have and make it work. Tire chains are a pain, so I add as much
ballast weight as I can in the winter for snow, and that helps the R4s work better. But, that is not an approach I would recommend for muddy conditions. For mud, or wet ground that’s hiding mud, I recommend staying out of it completely with R4 tires. So if you operate in mud, don’t get R4s, period, full-stop. For any other conditions you can use an R4 tires. If I ever buy another new tractor I’ll probably go back to R1 because there are still times that I miss having them, but if I buy used again I’ll take what’s on it and adjust.