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Wheels & Tires Showcase your wheels and tires. Also, discuss which tires you use.

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Old 03-22-2010, 01:26 PM   Thread Starter #1
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Default Tire info. Speed Rating/Load Index/Service Description

EXAMPLE:
Using a P195/60R15 87S tire size as our example, the 87S at the end of the size represents the tire's service description. A service description identifies the tire's load index and speed rating. Service Descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since 1991.

The first two digits (87S) represent the tire's load index and are followed by a single letter (87S) identifying the tire's speed rating.

Load Index

P195/60R15 87S - The load index (87) is the tire size's assigned numerical value used to compare relative load carrying capabilities. In the case of our example the 87 identifies the tires ability to carry approximately 1,201 pounds.

The higher the tire's load index number, the greater its load carrying capacity.

89 = 1,279 pounds
88 = 1,235 pounds
87 = 1,201 pounds
86 = 1,168 pounds
85 = 1,135 pounds

A tire with a higher load index than that of the Original Equipment tire indicates an increase in load capacity. A tire with a load index equal to that of the Original Equipment tire indicates an equivalent load capacity. A tire with a lower load index than the Original Equipment tire indicates the tire does not equal the load capacity of the original.

Typically, the load indexes of the tires used on passenger cars and light trucks range from 70 to 110.

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


Speed Rating


In Germany some highways do not have speed limits and high speed driving is permitted. Speed ratings were established to match the speed capability of tires with the top speed capability of the vehicles to which they are applied. Speed ratings are established in kilometers per hour and subsequently converted to miles per hour (which explains why speed ratings appear established at "unusual" mile per hour increments). Despite the tire manufacturer's ability to manufacturer tires capable of high speeds, none of them recommend the use of their products in excess of legal speed limits. The maximum operating speed of a vehicle must be limited to the lowest speed rated tire on the vehicle.

Speed ratings are based on laboratory tests where the tire is pressed against a large diameter metal drum to reflect its appropriate load, and run at ever increasing speeds (in 6.2 mph steps in 10 minute increments) until the tire's required speed has been met.

It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.

Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:

225/50SR16 225/50SR16 89S or 225/50R16 89S


Each of these was an acceptable method of identifying speed ratings.

Early tires had their speed rating symbol shown "within" the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.

225/50SR16 112 mph, 180 km/h
225/50HR16 130, 210 km/h
225/50VR16 in excess of 130 mph, 210 km/h


Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire's service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:

L 75 mph 120 km/h Off-Road & Light Truck Tires
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


When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.

W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars


While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h


Most recently, when the Y-speed rating indicated in a service description is enclosed in parentheses, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:

285/35ZR19 99Y 186 mph, 300 km/h
285/35ZR19 (99Y) in excess of 186 mph, 300 km/h


As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.

*if anyone has trouble reading the charts or needs help with this post please pm me with your question and i will be glad to answer*
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Last edited by Blackoutt; 03-23-2010 at 10:11 AM.
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Old 03-22-2010, 04:07 PM   #2
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Understanding the "Speed Ratings"

U:
124mph
H: 130mph
V: 149mph
W: 168mph

The main reason why a certain vehicle is locked to a speed limiter is because of the tires it comes out of the factory!!!

For example a 2004 Nissan Maxima "SE" comes with 245/45/18 V Rated tires that is why you see the "SE" models reaching 145mph top speed hitting the limiter at 147mph

Now.... 2004 Nissan Maxima "SL" equipped with 225/55/17 H Rated tires thus only achieving around 130mph while hitting the speed limiter.

You should be very careful when buying a tire check the speed load letter!!!

UTQG Uniform Tire Quality Grade

Most will be around 350 A A - 420 A A

*Choose the one that has the highest number you can find*
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Old 03-22-2010, 05:04 PM   Thread Starter #3
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Default Re: Tire info. Speed Rating/Load Index/Service Description

i knwo i saw it but it only had a few ratings i dont think i saw them all so i figured i dput together a full thread. i didnt mean to step on your toes owen. promise
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Old 03-22-2010, 05:26 PM   #4
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Ill move this to tire section
and stuck
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Old 03-22-2010, 06:35 PM   Thread Starter #5
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Default Re: Tire info. Speed Rating/Load Index/Service Description

sweet my first sticky lol thanx owen!!
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Old 03-23-2010, 08:53 AM   #6
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Nice info bro.. this combined w/ owen's is some info I & a lot of ppl never knew abt tires.
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Old 03-23-2010, 09:31 AM   #7
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Merged with Owen's thread.
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Old 02-11-2014, 02:59 AM   #8
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Originally Posted by OwenMaxx View Post
Understanding the "Speed Ratings"

U:
124mph
H: 130mph
V: 149mph
W: 168mph

The main reason why a certain vehicle is locked to a speed limiter is because of the tires it comes out of the factory!!!

For example a 2004 Nissan Maxima "SE" comes with 245/45/18 V Rated tires that is why you see the "SE" models reaching 145mph top speed hitting the limiter at 147mph

Now.... 2004 Nissan Maxima "SL" equipped with 225/55/17 H Rated tires thus only achieving around 130mph while hitting the speed limiter.

You should be very careful when buying a tire check the speed load letter!!!

UTQG Uniform Tire Quality Grade

Most will be around 350 A A - 420 A A

*Choose the one that has the highest number you can find*
I have 05 maxima sl and I wana use 18x8 front and 18x9 rear (rims) do u know what sizes of tires I need?? TY
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Old 02-11-2014, 03:01 AM   #9
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Default Re: Tire info. Speed Rating/Load Index/Service Description

Originally Posted by OwenMaxx View Post
Understanding the "Speed Ratings"

U:
124mph
H: 130mph
V: 149mph
W: 168mph

The main reason why a certain vehicle is locked to a speed limiter is because of the tires it comes out of the factory!!!

For example a 2004 Nissan Maxima "SE" comes with 245/45/18 V Rated tires that is why you see the "SE" models reaching 145mph top speed hitting the limiter at 147mph

Now.... 2004 Nissan Maxima "SL" equipped with 225/55/17 H Rated tires thus only achieving around 130mph while hitting the speed limiter.

You should be very careful when buying a tire check the speed load letter!!!

UTQG Uniform Tire Quality Grade

Most will be around 350 A A - 420 A A

*Choose the one that has the highest number you can find*
I have 05 maxima sl and I wana use 18x8 front and 18x9 rear (rims) do u know what sizes of tires I need?? TY
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