I wonder how grooving the R4's affects tire wear during non snow conditions. Out in the woods, climbing over rocks, stumps, etc. Deadman, gladehound keep us apprized!
As far as the wear goes, I'd rather have a tire that has traction and wears out in a few years. The R4's had little traction and would have put me thru many years of spinning and sliding around. I'd be more than happy even if these Grooves made my R4's wear twice as fast. I know they won't wear twice as fast, but honestly I won't be upset if they do wear out faster.
Like Gladehound said, its almost impossible to put into word how much better these tires are now. Until someone tries this themselves, it will never set in like mine has. Honestly, traction has more than doubled in snow. :thumbsup:
On the size of your cuts, ya, the blades are numbered and that is a standard measurement I believe. I used the smaller knife on my fronts, because i know I can always cut them larger if needed. I tried it on a junk tire I had laying around, and then measured and examined it to be sure that was the width and depth that I wanted. I cut my fronts about 3/4 the way thru the lugs depth wise. The rears are much less in comparison, because the lugs are so much beefier. I can always cut them again in a few years if its necessary.
I liked the angles on my front cuts, because that offers "side traction", and some "forward traction". I needed the side traction the most, and that has helped. I think they will be awesome in the dirt, but I won't know until mother nature melts the blanket of snow!