Bigger tires and rims for sons sportsman 110cc

[fat tire]

Looking to put a big tire and rim on my sons Polaris sportsman 110. It has a 4x110 bolt pattern not the regular 156 typical Polaris bolt pattern but still need something that will fit over the raised center on the hub. Anyone out there have something kicking around that would fit I would not want to be bigger than a 22" as it currently has 18" on 8" rim........... Thoughts. Help ! Thanks in advance

 

[toyz]

I put 22' tires on my kids cat 90cc 2 stroke. I just use the stock rims. I think I got them from princess auto. Huge difference as he could float across the skeg with those tires.