will these bearclaws fit on stock rims?

I have a 2011 550 Eps with stock tires and rims I wondering if up sizing to Kenda K299 Bearclaws would pose any problem. I dont plan of doing any clutch work. and am looking for something to mount on stock rims.thinking of
bearclaws
26x11x12 Back and 26x9x12 front

not sure of stock rim width

One inch taller and one inch wider, will this pose any problems and will they mount on stock rims or should I just stick to stock size
25x10x12 back
25x8x12 front

Live back east and trail ride deep forest and plow snow