Warning: OME + Sequoia wheels + 285's = serious UCA rubbing

[trd_4runnin]

Just to straighten up some of the confusion about speeds and tire diameters here, all it takes is to run the numbers through a tire size calculator.
If your vehicle originally came with 225/75/15, and are now running 285/70/17, then your speedometer is off by ~15.6%, for 285/75/16 you are off by 16.1%.
225/75/15 vs. 285/70/17

actual speedometer
81 70
69 60
58 50
46 40
80 69
70 61
60 52
50 43
If instead you had the more common 265/70/16 OE size, then you are only off by 6.8 and 7.1% respectively

265/70/16 vs. 285/70/17
actual speedometer
75 70
64 60
53 50
43 40
80 75
70 65
60 56
50 47

So indeed at 70mph on your speedometer, your gps should be showing 80-82mph, whereas if you started with the larger OEM size, then the differences between speeds will usually be less than 10mph

Thanks for the clarification. When I originally posted my information in regards to the 10 mph being off, I didn't account for the original tire size being the 225/75/15. Honestly I kinda forget 4Runners came with those sometimes.

Rim size does matter though, a 265/70/R17 will equal a 265/75/R16, there is a difference, i know what i am saying.

The only reason that rim size matters is because it changes the overall diameter. I think you know this, but don't want to admit it. A 265/75/R16 and a 265/70/R17 are nearly the same size tire and you wouldn't notice any change in speedo going from one to the other, even though you are changing wheel size. Conversly, if you go from a 265/70/R16 to a 265/75/R16, or a 285/75/R16, or hell even a 305/75/R16 you will notice a change in speedo reading even though you didn't change rim size. Again, I know what you were insinuating but let's not confuse other people when you know that the overall diameter of the wheel/tire is what throws off the speedo.

 

[LINY4Runner]

Basically a 33" tire is a 33" tire no matter what rim size is under it

 

[trd_4runnin]

Basically a 33" tire is a 33" tire no matter what rim size is under it

touche

 

[hrt4me]

Wheelers has spacers for one size, I believe 1/4 inch.

Black and Polished Alloy Toyota Truck Wheels from Wheeler's Off-Road

how well have those held up for you?