Doc, ol Jim Devro could make a new tire out of cactus or whatever else he could find in the desert. He's been doing hardcore 4x4 with various rigs and riding hardcore of all types for a long time. We'll be riding somewhere in the remote Ozarks and Devro will stop and point at a nasty hill or waterfall creek crossing and tell about his 4x4 days when he tackled it. He has driven a Toyota 4Runner through terrain that I couldn't do on a trials bike. He don't get lost either. Devro don't use GPS to check his route, GPS managers double check with Devro to see if the satellite is telling it right. He's pretty much a real McGuyver. When you take a truck where he has you kinda have to fix what you break on the spot. I bought his old XR 250 which he raced GNCCs with, and I found more cool little things he did and made for it. He made the rear disc brake from a John Deere log skidder brake disc, homeade but well engineered frame/motor/exhaust braces, it had a homeade fork brace which worked great, if a little ugly. He don't need tires, he'll make one out of some old tennis shoes or tree bark or something. If you ever get the chance to ride with Devro, take it. He's been everywhere in the Ozarks and lived to tell the tale.I call him "Daniel Boone Devro".