I am going to purchase a set of 285/50R20 tires with 20" Rockstar wheels. My question is what measurement of backspacing do I need on the wheel?

 

I have 285/50/20's with an offset of 19mm on a 9" wide rim. Another DF member has the same tires with an offset of 25mm on a 9" wide rim. I rub just a touch on the front swaybar at full turn on one side. The guy with 25mm offset rubs a bit on both sides. So they both work pretty good, keep it close to that.

There was some trimming of the front splash guards and wheelwell liners for the both of us. If you're not leveled, you may be in for some serious rubbing!

 

Thanks dakotaff. I guess you could say I am modeling my truck after yours in way. I have the same truck in a club cab version. I just ordered a leveling kit so I think I should be good.

 

dakotaff, when you say you have a backspacing of 19mm are you referring to the offset? All I have seen for backspacing is a number in and around the 5" mark.

 

Yeah, I meant to say offset. IIRC, my backspace is about 5.7". I love the look of the 285's, but it's gonna be winter wheel time soon!

I will edit my previous post to eliminate any confusion.

 

Thanks for clearing that up.

 

yeah i remember when i did the 20's deal...think i messed up my backspacing or something cause every time i hit the brakes the thing would just vibrate all to hell!