"What size tire will fit my FJ?" is by far the most asked question here on the forum.
The short, and most accurate answer is, "It depends." There are a lot of factors involved.
I'll be posting charts of what fits stock, with a body mount chop (BMC), and with BMC and lift.
Proper tire fit starts with proper wheel dimensions. See this post
on wheel dimension explanation. The factory wheel size
is 17"x 7.5"
, with a 6 on 5.5"
(6x139.7 mm) bolt pattern, with a 106.1mm hub bore
(aka center bore), and a 15mm offset
(or 4.84" backspace), which is laid out in this post
. Lug size is 12◊1.5
pitch.Varying too far from the factory offset will result in component and/or body contact problems, and/or subtle or not-so-subtle handling differences from stock.
Please note that you must run at least a 16" diameter wheel to clear the brake calipers.
Not all 16" wheels will fit! See this post for a list
of 16" wheels that can be run without spacers. When in doubt, run a 17" or larger wheel (though if you're running 22" or 24" wheels, you need to post pictures so we can all make fun of you).
Please note that different wheels have different offsets/backspacing, and construction, which makes exact predictions almost impossible. See this post
for more on wheel measurements.
Not all tires of the same size are actually
the same size. A 285/70/17 Dunlop highway tire may be of a different physical dimension that a 285/70/17 Goodyear mud tire. Consult with the manufacturer's website for the exact tire you are considering to see what the actual diameter is, if you think the fit will be tight.
Before you start asking questions
, be sure you know how to read a Metric tire size
: e.g. 265/70/17, where:
- 265 is the tread width in millimeters,
- 70 is the aspect ratio (sidewall height as a percentage of tread width, so 70% of 265mm = 185.5mm), and
- 17 as the rim diameter in inches.
So a 265/70/17 should be 10.43" wide and 31.6" high (here's the math: 265mm wide = 10.43" wide. 70% of 10.43 = 7.3" but we have 2 sidewalls - one on either side of the rim - so add 7.3" and 7.3" to make tire height 14.6", and add in a 17" rim = 31.6"
). Going to a 285/70/17 will be 0.8" wider, and 1.1" taller. Got it? Good. If not, go back and read the last paragraph again. When you understand the above paragraph, you can calculate any tire size.
If you don't know how to convert millimeters to inches
, there are 25.4 millimeters in an inch
Also, alignment settings on the front can alter fit quite a bit.
For this reason, the charts below are just a starting point
, especially if you are planning a size much wider than 12". If you are planning on running a big tire with not a lot of modifications, a fit test is essential
. Find a tire and wheel dealer that will let you do a test fit without commitment.
Here is a link to a metric to inch tire size converter.
(don't buy Jeep wheels - the bolt pattern is not correct)
I'm going to continue editing my posts in this thread, adding more useful information and editing for clarity.