I have the same exact tires on my 400 4x4 prarie and can honestly say these are great tires. I don't usually recomend much of the things I own because I can usually find a fault in most things. These tires are just plain great. The only issue I have is the over-all height I ended up with when I mounted them on my stock rims. I now have 25" fronts and can easiliy make the back into 27" with out adding huge amount of air (6psi each). This 25"/27" combo is not what I expect when I buy 26" tires.
I can't say wether you will experience the same problem as your grizzly probably has a 12" rear wheel as where my prarie has a 10" wide rear wheel.
If I was to order these tires again I would get 27" fronts and 26" rears. this way I might end up with 26.5" high tires all around.

 

The rear tires will be 12"wide, I was not sure if I should use 10or 12" rims.I have 10"rims on my SP500 and they look good.I'll keep my Grizz. stock tires for trade in , tradepot.com sells 26" Mudrunners for$548, installed on 12" alum. .190 rims.
DaveC, I would buy 25"Mudrunners, but they seem to be short/jefffox said 24"plus/. That's why I decided for 26".Now I hear that 26 may be a trouble ,too??
According to ATV magazine the Mudrunners are the best 25" tires they tested in 76 tires shootout. Followed closely by SuperSwamper TSL.The 25" Super Swamper TSL are actually 25 3/4 high /ATV mag. reported/. I have to do more "size" research......

Joe

 

I've had a set of 25" & 26" mudrunners and have found them to be as tall as advertised, they are great tires,good on all surfaces,easy to steer,last long,ride great---- you won't be disapointed.

 

I had the 25" mudrunners on my kodiak and they measured a little short. I sold them because i wanted aluminum rims and a larger tire. I got a 26" mudrunner tire package from treadepot.com. They measure out fine. i think the mudrunners are the best all-around tire out there. You will like them alot.

 

The Mudrunners package from treadepot.com is my choice,too.Thanks for your help.
Joe