{"id":4588,"date":"2020-05-12T16:17:13","date_gmt":"2020-05-12T16:17:13","guid":{"rendered":"https:\/\/www.xtremediesel.com\/blog\/?p=4588"},"modified":"2025-12-11T14:28:55","modified_gmt":"2025-12-11T14:28:55","slug":"tires-102","status":"publish","type":"post","link":"https:\/\/www.xtremediesel.com\/blog\/2020\/05\/12\/tires-102\/","title":{"rendered":"Tires 102"},"content":{"rendered":"\n
\"Fuel<\/figure>\n\n\n\n

In our first installment \u2018Tires 101\u2018, we dipped one toe into the water and started going over the basics of tires. We also learned how to decipher metric tire sizes, and convert metric sizes to inches. Now we will go into a little more detail about tire construction and further define some of the terminology written on the side of the tire.<\/p>\n\n\n\n

Tire<\/mark> Class<\/mark><\/h2>\n\n\n\n

These letters before (or after) the size convey two things, ply rating, which speaks to load-carrying capability, and tire type. No letter or a P, represents a standard load (4 ply rating) \u201cpassenger\u201d tire, or an extra load tire. Extra load tires offer more weight capacity than a normal standard load, but not as much as an LT tire. If your tire is extra load, it will have an XL after the size such as P255\/75R20XL.<\/p>\n\n\n\n

LT and ST tires are all heavier-weight-capacity tires. They can be Load Range C (6-ply rating), D (8-ply rating), or E (10-ply rating). They can even be F or G (12 and 14-ply) on motor homes or trailers. LT means \u201cLight Truck\u201d and is for pickups and vans. ST refers to \u201cSpecial Trailer\u201d and are \u201cfor trailer service only\u201d.<\/p>\n\n\n\n

Half-ton or smaller pickups and SUVs often use P metric, standard load tires. 3\/4 and 1-ton pickups & vans must use higher load ranges, usually D or E. In other words, you can go higher in ply rating on half tons and SUVs, but you never want to go lower than D on 3\/4 and 1 tons.<\/p>\n\n\n\n

ST tires are not designed for the requirements of a motor vehicle, and should never be used on anything but a trailer. Standard load tires can be used on trailers, but only very light ones. Heavy trailers should always use higher ply rating tires (ST or LT) that have sufficient weight capacity for the trailer when fully loaded.<\/p>\n\n\n\n

Tire Construction<\/mark><\/h2>\n\n\n\n

The letter before the rim diameter represents the \u201cconstruction type\u201d of the tire. There are two types, Bias and Radial. Bias tires have belts in the tire that have a \u201cBias\u201d or slant, forming an X pattern across the tire. \u2018B\u2019 and \u2018D\u2019 are both Bias belted tires \u2013 \u2018B\u2019 stands for \u201cBias\u201d, and \u2018D\u2019 stands for \u201cDiagonal\u201d.<\/p>\n\n\n\n

Radial tires, which have an \u2018R\u2019, have belts that go \u201cRadially\u201d straight across the tire (or perpendicular to the tread). The vast majority of tires sold nowadays are radial and for good reason. When a bias tire\u2019s tread hits the ground, the diagonal belting causes the tread to compress together. A radial\u2019s tread, on the other hand, stays flatter and instead flexes in the sidewall. The folding action of the bias tire inhibits traction, particularly on slippery surfaces, and also causes drag and heat build-up. This results in the radial tire offering better traction, better fuel mileage, and substantially better wear.<\/p>\n\n\n\n

You might wonder why they still sell bias tires at all. Apart from cost, there is one good reason: Bias belted tires seem to stand up better to age. So if you have an old truck or trailer that rarely gets used, a bias tire might actually be a better choice.<\/p>\n\n\n\n

What Is Load Range, Ply Rating, Load Index & Speed Rating?<\/mark><\/h2>\n\n\n\n

Often, you will see a number and letter following the tire size. This set of information denotes the load and speed rating. On some tires, you may see three letters instead of one. The first gives the speed rating while the next two indicate the load range.<\/p>\n\n\n\n

Load Range and Ply Rating<\/mark><\/h2>\n\n\n\n

The load range is also known as ply rating \u2014 a term that dates back to the days of bias-ply tires, which had different numbers of ply layers. More layers indicated a better and stronger tire. Today, ply rating still refers to the strength of the tire, but since fewer, stronger plies are used, the numbers have been replaced in some cases by load range letters.<\/p>\n\n\n\n

The load ranges for passenger tires have a listing beneath the tire code with information about the maximum load range and tire pressures. The load range indicates the heaviest load the tire can handle in pounds. Maximum tire pressure indicates the highest you can inflate the tires, but do not fill your tires to this pressure. It reflects the highest pressure the tire can handle when carrying its maximum load. Use the pressure given in your vehicle\u2019s owner\u2019s manual for the ideal tire pressure that creates the most comfortable and safest ride.<\/p>\n\n\n\n

Light truckload ranges have letters B, C, D, E, and F, and they have increasing maximum pressures. The lowest pressure is for B tires with 35 psi, and C has a pressure of 50 psi. The pressures increase in increments of 15 from 65 psi, 80 psi, and 95 psi for tires with load ranges of D, E, and F. For work trucks, the most common load ranges are C, D, and E. Commercial trucks, which have much higher carrying requirements, have load ranges from F through L.<\/p>\n\n\n\n

In some cases, you may see a number after the load range number, for example, C1 or C2. They still have the same number of plies, but the numbers designate differing max pressures.<\/p>\n\n\n\n

LT Load Ranges<\/h3>\n\n\n\n
Load Range<\/strong><\/td>Ply Rating<\/strong><\/td>Max Load Pressure<\/strong><\/td><\/tr>
B<\/td>4<\/td>35 psi<\/td><\/tr>
C<\/td>6<\/td>50 psi<\/td><\/tr>
D<\/td>8<\/td>65 psi<\/td><\/tr>
E<\/td>10<\/td>80 psi<\/td><\/tr>
F<\/td>12<\/td>95 psi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Load Index<\/mark><\/h2>\n\n\n\n

The load index on a tire gives a numerical value for the maximum weight the tire can handle when it is inflated to its recommended pressure. Higher numbers correlate to the tire\u2019s ability to bear heavier loads. Indices start at 1, which can carry 102 pounds, and they go up to 150, which can hold up 7,385 pounds. In the example, 35\u00d712.50R20LT 125Q 12PR, the 125 load index means the tire can carry up to 3,638 pounds.<\/p>\n\n\n\n

Like tire load ratings, the higher the load index, the more robust the tire is. Higher load indices correspond to tires used for hauling cargo or for installation on work trucks. No matter how strong the tire is, though, it\u2019s important to remember to never carry weights that are heavier than your tires or vehicle\u2019s suspension are rated for.<\/p>\n\n\n\n

If you see a pair of load ratings, this is not a mistake. Instead, these LT tires have an additional load rating listed for dual tire application. The first number gives the load index for the tires when used on a single axle. The second number is how much the tire can handle when used on a dual axle.<\/p>\n\n\n\n

For instance, if you see a 126\/123 for the load index, this means the tire has an index of 126 when used by itself but only 123 when installed on a dual-tire axle. The second number is usually lower because of unequal load sharing when the tires are paired together. However, when the tire is acting by itself, it can support a higher weight.<\/p>\n\n\n\n

Load Index<\/h3>\n\n\n\n
Load
Index<\/strong><\/td>		Max lbs.<\/strong><\/td>Load
Index<\/strong><\/td>		Max lbs.<\/strong><\/td>Load
Index<\/strong><\/td>		Max lbs.<\/strong><\/td><\/tr>
71<\/td>761<\/td>92<\/td>1389<\/td>112<\/td>2469<\/td><\/tr>
72<\/td>783<\/td>93<\/td>1433<\/td>113<\/td>2535<\/td><\/tr>
73<\/td>805<\/td>94<\/td>1477<\/td>113<\/td>2535<\/td><\/tr>
74<\/td>827<\/td>95<\/td>1521<\/td>114<\/td>2601<\/td><\/tr>
75<\/td>853<\/td>96<\/td>1565<\/td>115<\/td>2679<\/td><\/tr>
76<\/td>882<\/td>97<\/td>1609<\/td>116<\/td>2756<\/td><\/tr>
77<\/td>908<\/td>98<\/td>1653<\/td>117<\/td>2833<\/td><\/tr>
78<\/td>937<\/td>99<\/td>1709<\/td>118<\/td>2910<\/td><\/tr>
79<\/td>963<\/td>100<\/td>1764<\/td>119<\/td>2998<\/td><\/tr>
80<\/td>992<\/td>101<\/td>1819<\/td>120<\/td>3086<\/td><\/tr>
81<\/td>1019<\/td>102<\/td>1874<\/td>121<\/td>3197<\/td><\/tr>
82<\/td>1047<\/td>103<\/td>1929<\/td>122<\/td>3307<\/td><\/tr>
83<\/td>1074<\/td>104<\/td>1984<\/td>123<\/td>3417<\/td><\/tr>
84<\/td>1102<\/td>105<\/td>2039<\/td>124<\/td>3527<\/td><\/tr>
85<\/td>1135<\/td>106<\/td>2094<\/td>125<\/td>3638<\/td><\/tr>
86<\/td>1168<\/td>107<\/td>2149<\/td>126<\/td>3748<\/td><\/tr>
87<\/td>1201<\/td>108<\/td>2205<\/td>127<\/td>3858<\/td><\/tr>
89<\/td>1279<\/td>109<\/td>2271<\/td>128<\/td>3968<\/td><\/tr>
90<\/td>1323<\/td>110<\/td>2337<\/td>129<\/td>4079<\/td><\/tr>
91<\/td>1356<\/td>111<\/td>2403<\/td>130<\/td>4189<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Speed Rating<\/mark><\/h2>\n\n\n\n

Typically, for trucks, speed is not the most critical factor, which explains why a speed rating of R for heavy-duty trucks has a limit of only 106 mph. Those who drive sports cars or race usually require tires built for higher speeds. If you need to haul cargo, look for the load index or range, which will help you to identify the best tires for your operation.<\/p>\n\n\n\n

In the example tire, P325\/60R20 10PR 126\/123R, the R indicates the speed index of up to 106 mph.<\/p>\n\n\n\n

Speed Ratings<\/h3>\n\n\n\n
Letter<\/strong><\/td>Max
Speed<\/strong><\/td><\/tr>
L<\/td>75 mph \/ 120 km\/h<\/td><\/tr>
M<\/td>81 mph \/ 130 km\/h<\/td><\/tr>
N<\/td>87 mph \/ 140km\/h<\/td><\/tr>
P<\/td>93 mph \/ 150 km\/h<\/td><\/tr>
Q<\/td>99 mph \/ 160 km\/h<\/td><\/tr>
R<\/td>106 mph \/ 170 km\/h<\/td><\/tr>
S<\/td>112 mph \/ 180 km\/h<\/td><\/tr>
T<\/td>118 mph \/ 190 km\/h<\/td><\/tr>
U<\/td>124 mph \/ 200 km\/h<\/td><\/tr>
H<\/td>130 mph \/ 210 km\/h<\/td><\/tr>
V<\/td>149 mph \/ 240 km\/h<\/td><\/tr>
W<\/td>168 mph \/ 270 km\/h<\/td><\/tr>
Y<\/td>186 mph \/ 300 km\/h<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Choosing the Correct Tire<\/mark><\/h2>\n\n\n\n

Hopefully, some of this information will be helpful next time you purchase tires. As a baseline, it is a good idea to choose tire sizes and the minimum load ratings recommended by the manufacturer. The demands of your tires can change, depending on how you use your truck. If you pull a trailer or haul heavy loads on a regular basis, don’t forget to take that into consideration when shopping for your next set of tires.<\/p>\n\n\n\n

Shop at XDP<\/mark> for your next set of tires today!<\/p>\n","protected":false},"excerpt":{"rendered":"

In our first installment \u2018Tires 101\u2018, we dipped one toe into the water and started going over the basics of tires. We also learned how to decipher metric tire sizes, and convert metric sizes to inches. Now we will go into a little more detail about tire construction and further define some of the terminology […]<\/p>\n","protected":false},"author":18,"featured_media":4574,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4,7,3,176],"tags":[],"class_list":["post-4588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-duramax","category-powerstroke","category-dodge-ram","category-tech-talk","the-post-small"],"acf":[],"yoast_head":"\nTires 102 - XDP Blog<\/title>\n<meta name=\"description\" content=\"In the second part of our truck tire series, we go into more detail on the construction of tires and help define tire terminology.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xtremediesel.com\/blog\/2020\/05\/12\/tires-102\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tires 102 - 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