I have a Cat 236B. The other day I was helping my neighboor clean up some junk and I drove over a rotten board with a couple spikes in it. I putt a spike hole in both tires on the right side of the machine. In it's previous job the machine was used in such a way that the tires on the right had substantially less tread than the ones on the left. I'm wondering if it's possible or worthwhile repairing the tires, and opinions on if I purchased 2 new tires and put them on the back and moved the left ones to the front. I've heard that for vehicles it is bad to put different sized tires on them but I thought that maybe it's OK for the Skid Steer. Also any opinion out there regarding types of tires. Are aftermarket Good, will they fit. Thanks kindly and have a great day !!!