[sanddrag]

I think I've finally hit the sweet spot in wheel selection. Colson Wheels. They are great. Durable. Easy to work with. Wide variety of sizes. Very affordable (~$8 for 6"). Not too heavy (about 1 lb for 6", can be lightened) Available at www.robotmarketplace.com and from the distributors listed on www.colsoncaster.com. They are just all around great wheels. You'll have to make hubs for them if you wish to go live axle but that isn't too hard. You could probably knurl some hubs and press them in. Traction is more than the kit wheels but less than incline conveyor belting. You can screw conveyor belting into them if you wish. Anyway, I've fallen in love with them. Check them out.