have a lot of experience on this subject, as every piece of machinery in our shop is on wheels...with some weighing in at over 1,000 lbs.-plus, including our oliver, 12 ft. pattern maker's lathe(over 2,000 lbs!)...if you are not going to be moving the machine frequently, and it has a good amount of weight to it, stay away from a rubber wheel...it can develop a flat spot if sitting for a long period of time...rubber is quieter though, if that is a concern...so a polyethylene wheel will solve that issue...next you want double row, ball bearings, with a grease fitting, on the "truck" of the caster, with the bearing raceways set up so the balls can never come out from the sides...somewhat like a protective hood...finally, and this is a must, you want needle bearings on the wheel axel, and again, with a grease fitting...if you like, I can post some photos here of our equipment...let me know...joe
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