You wont be able to get the tire off with tire irons alone, you need to break the bead on both sides first. I have a very old fashoned bead breaker, its just a lever with a platform that the tire/rim sits on. It works pretty good once you get the hang of it. I have changed a bunch of atv tires, but there are times that it is just not possible for me to do, and just end up having to bring the tire to a shop and have them use their pneumatic breaker, which is effortless. There are a lot of threads on here about this topic if the search function will work for you for more help. Good luck!
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes