If you are askin' if they are great tires, for $40 bucks you can't get burned, but with your mods you should be fine. I ran "Gecko's" (I know, I know what the hell was I thinkin') we all started out sometime. Anyway they ran fine for a while, but they don't have the traction that better quality tires do, so I am in search for a good tire for a 421 cub myself. Try them out for a while and see how you like them............... :beer: