Tire Index

On the sidewall of all tires you will find the Load Index and Speed Rating for that tire. An example of this is the 115S that we will be using in the example below. There is also a couple reference charts included at the bottom to look up any tire load rating or tire speed rating that you are interested in.

Tire Load Ratings For The Chevy Silverado 1500

Understanding what the numbers mean in the Tire Load Ratings like 99T, 115S, and so on.

That 115S tire load rating tells you a lot about the applications for these tires. A tire with a load index of 115, it can support 2,679 pounds at maximum air pressure. Take that number and multiply it by 4 tires (4 x 2,679 = 10,716 pounds) to get your vehicles maximum load carrying capacity. The S is the speed rating, in this case S = 112mph.

Tire Load Rating Chart

The tires load index is an number ranging from 0 to 279 that corresponds with the load-carrying capacity of a tire. For the light truck tires we will only be looking at the ratings between 0 and 150 in the chart below. This will include tires through 10 ply rating and should cover about all tires used on the Chevrolet Silverado 1500, 2500 and 3500 series pickups.

Light Truck Tires—Ply Ratings are actually an old and outdated designation that has been replaced by the much more descriptive Tire Load Rating. Looking back, a "C" indicates the tire has a 6-ply load carrying capacity. The tire is not actually built with 6 plies, but contains one or two plies of equivalent strength. A "D" is an 8-ply rating, and an "E" is a 10-ply rating. If there is no letter, the tire has a standard 4-ply rating.

Load- Carrying Capacity Index Ratings
Load Index	Load (lbs)	Load Index	Load (lbs)	Load Index	Load (lbs)
0	99	50	419	100	1764
1	102	51	430	101	1819
2	105	52	441	102	1874
3	107	53	454	103	1929
4	110	54	467	104	1984
5	114	55	481	105	2039
6	117	56	494	106	2094
7	120	57	507	107	2149
8	123	58	520	108	2205
9	128	59	536	109	2271
10	132	60	551	110	2337
11	136	61	567	111	2403
12	139	62	584	112	2469
13	143	63	600	113	2535
14	148	64	617	114	2601
15	152	65	639	115	2679
16	157	66	639	116	2756
17	161	67	677	117	2833
18	165	68	694	118	2910
19	171	69	716	119	2998
20	176	70	739	120	3086
21	182	71	761	121	3197
22	187	72	783	122	3307
23	193	73	805	123	3417
24	198	74	827	124	3527
25	204	75	852	125	3638
26	209	76	882	126	3748
27	215	77	908	127	3858
28	220	78	937	128	3968
29	227	79	963	129	4079
30	234	80	992	130	4189
31	240	81	1019	131	4289
32	247	82	1047	132	4409
33	254	83	1074	133	4541
34	260	84	1102	134	4674
35	267	85	1135	135	4806
36	276	86	1168	136	4938
37	282	87	1201	137	5071
38	291	88	1235	138	5203
39	300	89	1279	139	5357
40	309	90	1323	140	5512
41	320	91	1356	141	5677
42	331	92	1389	142	5842
43	342	93	1433	143	6008
44	353	94	1477	144	6173
45	364	95	1521	145	6393
46	375	96	1565	146	6614
47	386	97	1609	147	6779
48	397	98	1653	148	6844
49	408	99	1709	149	7165
				150	7385

Tire Speed Rating Chart

The tires speed rating is most commonly associated with the maximum speed a tire can sustain for a certain period of time without risk of tire failure. But this number is about a lot more than just speed. The Tire Speed Rating is also about performance and tells you a lot about just how that tire will perform in various situations. The Tire Speed Rating tells you about how efficient your tires are at getting rid of heat and how well they perform in braking, cornering as well as how well they will grip and swerve on the road.

SPEED SYMBOLS
Speed Rating	Speed (kph)	Speed (mph)
A1	5	3
A2	10	6
A3	15	9
A4	20	12
A5	25	16
A6	30	19
A8	40	25
B	50	31
C	60	37
D	65	40
E	70	43
F	80	50
G	90	56
J	100	62
K	110	68
L	120	75
M	130	81
N	140	87
P	150	94
Q	160	100
R	170	106
S	180	112
T	190	118
U	200	124
H	210	130
V	240	149
W	270	168
Y	300	186

Here is a great article on Tire Speed Ratings from KalTire.com

Chevrolet Silverado	Tire and Wheel Packages	Installed Accessories
2014 Chevy Silverado 2013 Silverado 2012 Silverado 2013 Chevy Silverado Concept Chevy Silverado Questions and Answers Chevy Silverado Z71 Pictures 2011 Chevrolet Silverado Curb Weight Chevy Silverado All Star Package Chevy Silverado 5.3 Flex Fuel Chevy Silverado 5.3 V8 6 Speed 6L80-E Automatic Transmission 2014 Chevy Silverado 4by4 in Spokane	Chevy Wheel and Tire Packages Cooper AT3 285-70-17 Cooper AT3 on Silverado Cooper ST Maxx Cooper STT Tires BF Goodrich AT TA KO Pro Comp Xtreme AT Pro Comp Xtreme MT Tire Load Ratings	Chevy Silverado HID Headlight Kits Chevy Silverado HID Fog Lights Chevy Silverado LED Taillights Chevy Silverado LED Dome Lights Bushwacker Extend-A-Fender Borla Cat Back Exhausts Airaid Cold Air Intakes Sprayed On Bed Liners, Spokane WA. Choosing Gear Ratio 3.08 or 3.42 Gear Ratio Change 3.08 to 3.73 Installing 4.56 or 4.11 Gears Chevy Silverado Lift Kits Chevy Silverado Leveling Kits Air Lift Suspension

Chevy Silverado 1500 – Off-Road Accessories – Vortec LMG 5.3-liter V8

Tire Index

Tire Load Ratings For The Chevy Silverado 1500

Tire Load Rating Chart

Tire Speed Rating Chart