A common question I run across is “will (insert wheel) with (insert backspacing) tuck on my truck??” The answer to that question is more that likely yes (provided you are not talking about a zero or negative offset wheel) it’s those gd tires that get in the way. I hope this clears up some of the confusion.
Because I own a 2001, I’ll use the 99+ trucks as an example, but you can apply this to any vehicle you see fit.
On the 99+ trucks, the magic number is (about) 4 inches. (this number varies from truck to truck) This is the distance from the hub mounting surface to the edge of an unrolled rear fender. I chose to use the rear as an example for simplicity as the front wheels camber in as the wheel travels into the fender, and are typically not a problem. As long as the distance from the hub mounting surface of the wheel to the front outer most edge of the tire (not wheel) is less than 4 inches, you will not have tucking issues. We’ll call this Total Frontspacing.
To figure out your total front spacing, you need to know some basic information. What is your wheel size, offset, and tire size. I’ll start with the stock wheels and tires.
Stock wheel size is 16x7 with a backspacing of about 5.25 inches. We must first get the centerline by adding 1 to the width and dividing by 2.
(7 + 1)/2 = 4 inches
Next we subtract the centerline from the backspacing to get the offset.
5.25 – 4 = 1.25 in offset
Now we need to find our tire size. Again, I’ll use my stock tire size…Michelin LTX M/S 255/70/16. According to the Michelin web site, this tire is 30.2 inches tall and 10.3 inches wide on a 7.5 inch wheel. For every half inch you need to get to your wheel size, you add or subtract 0.2 inches from the width of the tire. In other words, my tires are 30.2 in tall and 10.1 in wide on my stock 16x7.
To find to total backspacing/ frontspacing, we are going to apply the same principle we did to find wheel backspacing/ frontspacing.
The new centerline of the tire/ wheel combo is 5.05. we found this by dividing 10.1 by 2. Again we are dealing with a positive offset, so you add the 1.25 offset to the centerline to get a total backspacing of 6.3 in.
(10.1/ 2) + 1.25 = 6.3 in
This will let us find our total frontspacing by subtracting the backspacing from the tire width.
10.1 – 6.3 = 3.8 in
Since the 3.8 inch total frontspacing is less than 4, you should have no problems tucking this wheel/ tire combo. You can of course get around the 4 inch limit by rolling or trimming your fenders.
*note – you should take measurements when possible. these numbers are close, but not necessarily exact