Continental - 85mph. I actually sourced out the fastest 10 inch tire I could find for scooters and small powered vehicles. Had proper sleeves cut, and pressed into the factory bearing radius. Abec 3 bearings. I did a little reconfiguration after I rebuilt the suspension which is now good for 200 pounds worth of stuff easily, but you know I probably don't wanna pull that much weight back there. Too much to fight at low speeds in parking lots making short radius turns.
You can't even tell it's back there really.
I did run the Factory chain as I didn't have time to change it out and only had 100 miles on it. It's stretched pretty good on the trip. I'll be replacing it with an EKD3 here shortly.