OK, I have access to the local club's high-dollar tire groover. I read all of these which are fine and dandy but don't really help me much: http://www.4x4review.com/tech/siping.asp http://www.4x4wire.com/tech/grooved_tires/ http://www.can4x4.com/articles/siping.html I've read a few more but I don't know how much credibility they had. I've always believed in siping. Take a look at a good snow tire and you'll see why I like siping. My Weathermaster IIs are a fine example. I've always believed in grooving ATV tires and sand paddles (for ATVs and sandrails). However, the science of grooving a truck mud tire is beyond me. First off, my tires are used in mud and muddy sand and muddy sandy water and and and you get the picture. Not a whole lot of rocks. I've heard of cutting on a set of old tires to get more life out of them. I have a set of bald Grabber APs I'm willing to experiment on. I figure as long as I don't take more than 3/32nds off the tire I should be safe. Anyone ever try cutting a tire to get more tread life? They'll be a city-only tire if I do that. I don't want to be stranded out on the highway. Next, I have a set of Medalist MTs. They have wear bars between the lugs. Should I cut them out with the tire groover to get more flex or just leave them alone? I'm a little leary about cutting the lugs with the groover to make more lugs. However, I've been toying with the idea of siping. I'd cut in such a manner it wasn't more than 1/4" deep and never got to the edge of any lug, not even the center ones. I've got chunks of my tires tore off as it is and I don't need to lose any more chunks. What do you guys think? I know this has been discussed before but I don't think anybody has ever come up with a definitive way of grooving a tire. I'd be tickled pink if I could see some pictures of a successfully grooved tire. I have some pretty crappy pictures of my tires I just took if you want to know what the tread looks like. http://www.wrath.com/projects/vehicles/images/84k10/tiregrooving/ PS: hopefully soon I'll have enough money stashed away to pay for a membership. I've got just over $20 in loose change set aside since last December when I started saving. If I can do it, anyone can do it. It's really hard to justify spending more money on internet activities when you're already spending $75/month for webhosting and internet access.