As stated by the guy I got em from they have never been run, he says they swapped 5" Mancos onto the go kart right away and put the 4s on the shelf. Wheels are super nice, bearings marked "Korea" and the Cheng Shin NOS 4" slicks are Taiwan not china so these are old with no weather cracking. They also have inner spacers between the bearings. I am offering the wheels with or without a 36 tooth #35 sprocket from a Wards Gilson with the spacers, the sprocket matches the bolt pattern and the spacers will bring it out far enough to make it useable. You will have to drill and tap the wheel half to accommodate the mounting of the sprocket given the 4s were never drive or brake wheels but that's easy. No pics of the sprocket but I'll send you some if you have to see it. $185 shipped for everything, $160 shipped without the sprocket and spacers.