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Everything you NEED to know about tires before buying
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=65&t=5375		 Page 1 of 1
Author:  ManicMechanicJoe [ Mon Jan 30, 2006 2:34 pm ]
Post subject:  Everything you NEED to know about tires before buying
so you want a 245/75R16 eh? what does that mean?

The first number is the width in milimeters so a 245 is 245 militers wide.

The second number is the Aspect Ratio. It is the height of the sidewall as measured in a percent of the width. So the sidewall of your new tire is 75% tall as your tire is wide or 183.75 milimeters tall.

The letter following the aspect ratio is the construction of the tire:
R: means radial this is the most common tire found today because it handle the best, has longer life then bias ply and is quieter
D: This is the mark of a Bias Ply tire. bias ply is usually found on hardcore trail rigs because of their thick sidewalls. They are very noisy compared to radials, don't handle as well, and wear faster then radials...
B: this means belted...nobody sells them anymore and I don't have any info on them I believe the belts would come apart causing a premature blowout.

The last two digits are you wheel diameter in inches. In this case it is 16 inches.

So we have covered the size of the tire now on to ratings:

if the size begins with a P it is a passenger vehicles (SUV's, Minivans, Cars)
if it is LT it means it's a Light Truck tire (Pickups, SUV's). These tires are designed to carry more weight then a P rated tire.
if the tire size begins with a T-its a temporary use spare tire.

ok so you have decided that you want an LT245/75R16 and you now know what that means. On every tire using the metric sizing system will be 2 more digits and a letter following the size.

The two digits represent the load rating of the tire. For the most parts tires we as average consumers own are in the 70 to 110 ball park. 70 being the lowest load capacity and 110 being the highest. Since the typical stock KJ weighs in around 4600 pounds or so we want a tire in the 85-95 range.

The letter represents the speed rating of the tire like so:

M 81 mph
N 87 mph
P 93 mph
Q 99 mph
R 106 mph
S 112 mph
T 118 mph
U 124 mph
H 130 mph
V 149 mph
W 168 mph
Y 186 mph

You should end up with something like LT245/75R16 90S

If you need more help with tire sizes/ratings either PM me or look at http://www.tirerack.com/tires/tiretech/tiretech.jsp

Thanks to tirerack for helping me with the load ratings/speed ratings.
Author:  Se7enLC [ Tue Apr 25, 2006 2:39 pm ]
Post subject: 
Here are some common tire sizes and their relation to a stock size, 225/75R16:

Code:
Specification  Sidewall  Radius  Diameter  Circumference  Revs/Mile  Difference
235/70-16         6.5in  14.5in    29.0in         91.0in        697       -1.1%
225/75-16         6.6in  14.6in    29.3in         92.0in        689        0.0%
245/70-16         6.8in  14.8in    29.5in         92.7in        684        0.7%
265/65-16         6.8in  14.8in    29.6in         92.9in        682        0.9%
255/70-16         7.0in  15.0in    30.1in         94.4in        671        2.6%
245/75-16         7.2in  15.2in    30.5in         95.7in        662        4.0%
265/70-16         7.3in  15.3in    30.6in         96.2in        659        4.5%
255/75-16         7.5in  15.5in    31.1in         97.6in        649        6.0%
265/75-16         7.8in  15.8in    31.6in         99.4in        637        8.1%


And the common widths:

Code:
225mm = 8.9"
235mm = 9.3"
245mm = 9.6"
255mm = 10.0"
265mm = 10.4"
Author:  Special Agent [ Sun May 14, 2006 4:31 am ]
Post subject: 
Very useful! Thanks!
Author:  slikjr [ Tue Jun 06, 2006 10:36 pm ]
Post subject: 
EVERYTHING YOU NEED TO KNOW ABOUT KJ TIRES:

With stock suspension; a 235/70R16 is the biggest you can go with ZERO rubbing, a 245/70/R16 will fit and will only rub under extreme circumstances like full-lock cornering or cornering on inclines and bumps etc.
With 2.5" lift; a 265/75R16 will fit. I have yet to make mine rub under normal circumstances but can make them rub in above conditions.
Author:  kendall [ Tue Jun 27, 2006 2:53 pm ]
Post subject: 
I have a stock KJ with the 17" x 7.5" OEM chrome wheels (2005 model). How large a tire can I use without rubbing?
Author:  2006KJSPORT4x4 [ Tue Jun 27, 2006 3:12 pm ]
Post subject: 
probably a 245 maybe, some people have them on their stock rigs...i run a 255 with a lift and have rubbing
Author:  pixeldzn [ Tue Jun 27, 2006 3:56 pm ]
Post subject: 
RockyMtEditionKJ wrote:
probably a 245 maybe, some people have them on their stock rigs...i run a 255 with a lift and have rubbing


at 245 in 17" size is not the same as a 245 in 16" size. Be careful with your advice.

As far as I know, there is a size that fits well in the Pirelli Scorpions and maybe one other brand and thats it. Not a lot of options for that rim. Definitely no M/T options out the for you.
Author:  2006KJSPORT4x4 [ Tue Jun 27, 2006 4:02 pm ]
Post subject: 
that is why i stated "maybe" for i was not totally clear
Author:  tjkj2002 [ Tue Jun 27, 2006 8:14 pm ]
Post subject: 
Well since a 245/70R 16 fits(for 16" rims)just go ten down on the aspec ratio(the 70 part) for the extra inch for the rim size so 245/60R 17's are pretty much the same size(the width is the same and the height is very close to being the same,maybe a millimeter or two off) as 245/70R 16's.
Author:  SethX9 [ Wed Jun 28, 2006 1:28 am ]
Post subject: 
Quote:
at 245 in 17" size is not the same as a 245 in 16" size


nope...that is not true. 245 is the width of the tread in millimeters. 245 millimeters is 245 millimeters regardless of the radius of the wheel.
Author:  Jeepjeepster [ Tue Jul 25, 2006 3:13 pm ]
Post subject: 
SethX9 wrote:
Quote:
at 245 in 17" size is not the same as a 245 in 16" size


nope...that is not true. 245 is the width of the tread in millimeters. 245 millimeters is 245 millimeters regardless of the radius of the wheel.


When you have a bigger rim its make the overall DIA 1in bigger, or ever how many inches bigger the rim is.

A 245/70/17 tire is 1in bigger than a 245/70/16 tire. :wink:
Author:  wheeln [ Fri Aug 11, 2006 5:09 pm ]
Post subject: 
Well I have just recently purchased a 2003 KJ Limited. I am getting it lifted in three days with a Skyjacker lift 2.5. I wanted to keep my 17 rims but I see that there is some confusion about what tires will fit on those rims. I am also confused about which size tire's to get. I was going to try bfg all terrain 245 75 17 but I am not sure that they will not rub after reading the conversation. I was also thinking of trying silent armour 245 70 17 or a 245 65 17. Does any one here have any advise for me? Also I was wondering how to become a LOST member in Arizona? How do I get a LOST number?
Author:  CaKJFreedom [ Tue Aug 15, 2006 11:58 am ]
Post subject: 
Hi there,

Go ahead and post your tire concerns in the tire and wheel section, it's more active and you'll get a quicker response. (I took off my stock 17's and save them for normal use and got some 16" rims with mtrs for the cool stuff)

As far as joining up with the Arizona crew...there are some straight out awesome guys out there. Scroll down to the local club section and you can find the info there. You should pop in there too and introduce yourself! Have fun. :D
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