yellowsocks93
Veteran Member
I find the 990 or the 970 for that matter to be very stable on hills with the turf tires I run. They are the same size tires used on the large frame 4K series. Weekly I mow on the side of our country road with is very steep banked and have yet to run into a stability issue. The ags will make it more unstable but it still should be pretty solid. You can always switch the rims to the widest position. I think you would be happy with your purchase unless you need more horsepower.