I have a set of 20X10 Ultra Motorsports Goliath wheels that i need tires for. I am wanting the Nitto Dura Grappler, but am uncertain if the 275 55 20 will be wide enough for the rim. the price increase to the 305 is quite a bit higher. any help would be appreciated

 

I assume you mean a 275 75 R 20??? If not the size you listed would be roughly a 31 - 32 inch tire. But I dont even think they make tires with the demintions you posted.

Either way your going to have issues with rubbing becasue the witch of that rim if you didnt get good backspacing.

With a 9 in rim I want to say the proper BS is like 5.7 in??? But I could be a little off...

 

I have 305 55 20's on mine w/o a a leveling kit you wont be able to fit tires of that size