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Unread 11-16-2011, 11:24 AM   #1
jewfromdahood
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2003 KJ Liberty 
 
Join Date: Apr 2011
Location: Columbus, OH
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What do the numbers in tire size mean

Ok I have 235/70R16 I know the R16 means Rim 16". What does the rest mean. I have a 3" OME lift installed and was wondering what would be the biggest tire size I could fit without rubbing, on those big beefy tires like the Yokohama Geolanders I have currently on.

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Unread 11-16-2011, 11:57 AM   #2
streetglideok
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2005 KJ Liberty 
 
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235/75R16= 235(tread width in mm), 75(size of sidewall, percentage of tread width), R means its a radial tire, and 16 is the wheel diameter.

Worth noting, the tread width is a size spec, not all 235's are the same width. Cheap tires tend to run narrow. 75 would be 75% of 235. Sometimes you see "P" in front of the tire size, that means passenger tire. If you see "LT", that means light truck.

Now tires that are sized, like 31x10.5r15, etc, the sizes read different.
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Unread 11-16-2011, 12:40 PM   #3
Cards81fan
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Quote:
Originally Posted by jewfromdahood View Post
Ok I have 235/75R16 I know the R16 means Rim 16". What does the rest mean. I have a 3" OME lift installed and was wondering what would be the biggest tire size I could fit without rubbing, on those big beefy tires like the Yokohama Geolanders I have currently on.
As mentioned, 235 mm wide, sidewall is 75% of width (so 176.25 mm), and 16 inch rim.

So the tire height is the rim size plus two sidewalls (16 inches + 352.50 mm), or roughly 29.9 inches. Also as mentioned, this is an "on paper" measurement and actual tires may vary by make and model.

The "pretty much standard" lifted KJ tire size is 245/75r16. They may have minor rubbing but it would be very minor and very easily remedied (hammering the pinch weld, usually)

Some also do with 265/70r16 but the added width may cause issues. You can also go down to 255/70r16, which are a bit shorter than the 245 but have more width and may still rub.

I always liked the idea of the pizza cutter 215/85s, which are kinda popular on Rovers. But being tall and skinny, they are usually hard to find and expensive and E rated (which would ride really stiff on the KJ).

Comparison of the most of the Larger than Stock (225/75 or 235/70) 16" wheel tire sizes:

Code:
Specification  Sidewall  Radius  Diameter  Circumference
245/70-16         6.8in  14.8in    29.5in         92.7in
235/75-16         6.9in  14.9in    29.9in         93.9in
255/70-16         7.0in  15.0in    30.1in         94.4in
215/85-16         7.2in  15.2in    30.4in         95.5in
245/75-16         7.2in  15.2in    30.5in         95.7in
265/70-16         7.3in  15.3in    30.6in         96.2in
265/75-16         7.8in  15.8in    31.6in         99.4in
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Unread 11-16-2011, 12:55 PM   #4
Powerslave
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You can use this: http://www.1010tires.com/tiresizecalculator.asp to find a tire that is the same overall circumference as the OE tire.
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Unread 11-16-2011, 03:14 PM   #5
Cards81fan
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Only thing is, 235/75 that he is running isn't the OE tire size. 235/70s and 225/75s were, just to be clear
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Unread 11-16-2011, 03:34 PM   #6
jewfromdahood
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Quote:
Originally Posted by Cards81fan View Post
Only thing is, 235/75 that he is running isn't the OE tire size. 235/70s and 225/75s were, just to be clear
whoops I mean 235/70R16 I will fix it.
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