I will agree with the immediate order of urethane wheels even on the dc40. I order a set of wheels at the same time as orderind the 40's but a word in advance. Western shipped me rollers with a cast composite hub and urethane wheels. The hub I'd was a tiny bit small for comatics shift to wing style nuts as opposed to hex nuts. We had to grind about 2mm off the ends of each wing nut. The no tool wheel change is supper handy as we swap wheel configurations multiple times a day sometimes.