Tire size and rating information

**webracin** · 07-10-2008

This will be an ongoing post that I will update as more people provide information.

Please provide the information in the following format:

225/60R16 97S

INFORMATION

225/60R16 97S
The 225 is how many millimeters across the tire tread (from shoulder to shoulder)
The 60 is how tall the sidewall is in % of the tire tread width (225 divided by 60% is 135mm tall measured from the tire bead to the shoulder)
The R means its a Radial tire
The 16 is your rim size in inches.
The 97 indicates the load rating.

Load Index Pounds Kilograms

71 761 345
72 783 355
73 805 365
74 827 375
75 853 387
76 882 400
77 908 412
78 937 425
79 963 437
80 992 450
81 1019 462
82 1047 475
83 1074 487
84 1102 500
85 1135 515
86 1168 530
87 1201 545
88 1235 560
89 1279 580
90 1323 600
91 1356 615
92 1389 630
93 1433 650
94 1477 670
95 1521 690
96 1565 710
97 1609 730
98 1653 750
99 1709 775
100 1764 800
101 1819 825
102 1874 850
103 1929 875
104 1984 900
105 2039 925
106 2094 950
107 2149 975
108 2205 1000
109 2271 1030
110 2337 1060

And finally the S....This is the Speed rating for the tire

M 81 mph 130 km/h
N 87 mph 140km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars

Special thanks to Tire Rack as this information is pulled from their site.

Tire sizes that will work based on Rim Size

16 Inch Rims
225/60R16
235/55R16

17 Inch Rims
225/55R17 Stock diameter
235/50R17 1.39% too small so its good, but not perfect
235/55R17 2.03% too tall. Help fill out wheel wells, increased chance of rubbing.
245/50R17 is the same diameter of the stock tire. Expensive, limited selection.
255/45R17 Shorter than stock, but still within 3%. A fair amount of sizes available, but not recommended for wheels 7.5 in wide or narrower. (Would probably go well on mustang 17x8 wheels)

18 Inch Rims
245/45R18 Stock diameter.

20 Inch Rims

22 Inch Rims

webracin

**morkuma** · 07-10-2008

my tires are Y rated..
i also saw here ( Falken Tire ) that there are Z rated tires.
i have falken 452's 245/45/18 100Y
so what does the Y get me?

**Sabrewings** · 07-10-2008

Originally Posted by morkuma

my tires are Y rated..
i also saw here ( Falken Tire ) that there are Z rated tires.
i have falken 452's 245/45/18 100Y
so what does the Y get me?

186MPH sustained.

Tire Tech Information - How to Read Speed Rating, Load Index & Service Descriptions

**morkuma** · 07-10-2008

Originally Posted by Sabrewings

186MPH sustained.

Tire Tech Information - How to Read Speed Rating, Load Index & Service Descriptions

thanks buddy!

**GTPJOE90** · 02-05-2009

z rated are 200mph right? cuz i can go 200 lmao

**DanGTP** · 07-01-2009

Something to add to the available tire sizes:

245/50-17 is the same diameter of the stock tire.
245/45-17 is a little smaller diameter, but has more size options and better pricing.

255/45-17 is in between the above sizes, but wider. A fair amount of sizes available, but not recommended for wheels 7.5 in wide or narrower. (Would probably go well on mustang 17x8 wheels)

**cwizz** · 07-07-2009

I have 04 grand prix looking to get 245/50-20s just wanted to be sure that tire is not to big. can anybody help?

**DanGTP** · 07-07-2009

245/50-20 is a bit large of a tire. That is a 29.6" diameter tire, where the factory was 26.6".

245/35-20 would be closer to the right overall diameter.

**og512** · 07-20-2009

Will 255/35-20 rub on an 04+, stock height?

**Juanmiguel** · 03-05-2010

By saying that the tire size will work do you guys mean that it will not rub and also won't ge the TCS light on? I've read that if you change the diameter, the TCS light will come up.

**Ridin ON Chrome** · 03-16-2010

Originally Posted by Juanmiguel

By saying that the tire size will work do you guys mean that it will not rub and also won't ge the TCS light on? I've read that if you change the diameter, the TCS light will come up.

depends on what model GP. I think the 04+ might have that problem issue but only with go a diameter thats way different then stock.

**tod1d** · 07-25-2010

just looking on kijiji.com for rims and came across these mustang rims, I want to know if I could use them?
2003 Mustang GT wheels MINT CONDITION - St. Albert Tires, Rims For Sale - Kijiji St. Albert

These wheels were taken off at 15000km.they are perfect condition,17x8''5.72'' back spacing.Fits 94 and up mustang and ford rangers.$400.780 913 3843

I have All Season Michelins MXV4 Plus 225/55R17 95H with TPMS

Thanks

**gtpinsc** · 07-25-2010

^ yes they will fit.

**jakegsxr11** · 11-03-2010

Will I be able to fit my 1995 firebird rims with 245/50-16 tires on my 02 Grand Prix GT? The rims are 16x8 and they are also stamped 55.0....maybe that is the back spacing or off set or something?

Thanks

**Bio248** · 11-03-2010

that is the offset, +55mm.

also, those rims are the wrong bolt pattern so they will not fit a wbody.

**Odi** · 11-06-2010

bio, you should make a sticky that says NO, FIREBIRD WHEELS WONT WORK, since thats like the most asked question ever.

**Bio248** · 11-07-2010

if people read a little bit they would know that they are way different bolt patterns.

**eightyseven** · 11-24-2010

I'm putting grand am gt rims on as my winter rims. I was going to use my 16" Special Edition rims, but they look like they belong on my grandmother's buick. Plus I got a bad belt. The grand am rims are 16's, so I'll be looking for 225/60R16 tires, seen some nice michelin x tires. For summer I got 18" Metal FX rims with 235/40R18 tires, but they just look too small. What size tires would be best for my 18's? I think the tire needs to be 235/?R18?