I have an L3901 with R4's on it. I like the tires but find they are limited in mud and deeper snow. On my past tractors and my B7100 I have had R1's. They are narrower (different rim required) yet they go through mud/snow better. On the downside the fronts are narrow and have less surface area. When I fill the FEL bucket and lift they sink in. My rears are filled and I use lots of counter weight. My question is.... Do any manufactures make an R4 size (27×8.50-15) (15-19.5) with deeper lugs similar to the R1 ags? If I could find such a tire I could get the width flotation of the 4's and the grip of the 1's. If this makes sense... I looked into buying R1's but have to buy tires and rims. If anyone knows of a good r1 type lug that would fit on r4 rims it would be appreciated. Maybe I'm asking for something that doesn't exist.