Yeah no need to buy UST tires bro, just go with Stan's sealant. You can also buy Stan's UST valve stems that have the removeable core to add sealant without having to pop the tire out of the bead lock. I just did that on the front rim on my Pack and rode it on the ride on Sunday with no problems. You will however have a hell of a time getting the Kenda tires (non UST) to seal up with Stan's.....but once you get them fully sealed up they'll be fine for a long time. It usually takes at least 1 ride and lots of sloshing the sealant around to get the Kenda tires to not leak air.