That is what I needed to hear! I was already concerned about their weight and effect on the machine. I will consider the surefoots out of the picture. Thank you Tommy for all the research. I am deeply considering Two Guns comments on the 26" 589's. I think I will go that route. Should I tear them up , I will just go for the oem grips but hopefully before then, I will have a small tractor to take some of the spraying hours off of the RTV. I may just have to wimp it out and spray in the a/c with the 7210 tractor so I can pull more water mix.. I acutally prefer the open air and a shorter to the ground smaller tractor but.... if it wasn't for the size of the water tank restricting me , I would always ,always use the RTV with a set of good grips.. How much air do you keep in your rear 589's? Thank ya'll again. Bordercollie</p>