Having had the R1's, and the R4's, I won't go back to the R1's. I like the fact that the R4's clean up fast after going through mud, and the R1's didn't. A trail of mud for 100 yds wasn't my idea of what I wanted, and the R4's don't seem to do that. Traction with the R4's is not quite what the R1's were, but certainly sufficient for FEL work (don't dig a hole nearly as quick when spinning a bit). Working on the lawn is much better with the R4's and while I don't mow with this tractor, I do traverse the lawn a lot getting rocks, trees, and dirt distributed about. Leave no tracks, contrary to the R1's.
Just more info for whatever decision you guys want to make. /forums/images/graemlins/wink.gif