Some information about tyres:
The European Tyre and Rim Technical Organisation Standard.
LOAD INDEX = LI
KG PER TIRE = KG/T
LI KG/T LI KG/T LI KG/T LI KG/T
60 250 90 600 120 1400 150 3350
61 257 91 615 121 1450 151 3450
62 265 92 630 122 1500 152 3550
63 272 93 650 123 1550 153 3650
64 280 94 670 124 1600 154 3750
65 290 95 690 125 1650 155 3875
66 300 96 710 126 1700 156 4000
67 307 97 730 127 1750 157 4125
68 315 98 750 128 1800 158 4250
69 325 99 775 129 1850 159 4375
70 335 100 800 130 1900 160 4500
71 345 101 825 131 1950 161 4625
72 355 102 850 132 2000 162 4750
73 365 103 875 133 2060 163 4875
74 375 104 900 134 2120 164 5000
75 387 105 925 135 2180 165 5150
76 400 106 950 136 2240 166 5300
77 412 107 975 137 2300 167 5450
78 425 108 1000 138 2360 168 5600
79 437 109 1030 139 2430 169 5800
80 450 110 1060 140 2500 170 6000
81 462 111 1090 141 2575 171 6150
82 475 112 1120 142 2650 172 6300
83 487 113 1150 143 2725 173 6500
84 500 114 1180 144 2800 174 6700
85 515 115 1215 145 2900 175 6900
86 530 116 1250 146 3000 176 7100
87 545 117 1285 147 3075 177 7300
88 560 118 1320 148 3150 178 7500
89 580 119 1360 149 3250 179 7750
Tyre Speed Index
The KM/H is measured at sustained maximum speed.
SPEED SYMBOL SPEED (KM/H)
Z & ZR 240+
How to read sidewall tyre numbers and markings.
The sidewall of your tyres is filled with important information that tells you everything you need to know about your tyre. The numbers can be a bit overwhelming to the untrained eye, so the best way to understand tire markings is to take an example and break it down, bit by bit. Below are tips and information to help you learn how to read tyre size and other tyre markings commonly seen worldwide including South Africa.
A tyre size is 185/60 R14. The 185 represents its section width. The number "60" indicates the tyres aspect ratio. The last number, "14" indicates wheel diameter.
Tyre Section Width
The tyre numbers in the above example tell us that the tyre is 185 millimeters wide. The first number in this series refers to the tyre's section width, or distance from sidewall edge to sidewall edge (in millimeters) when measured up and over the tyre's tread. Generally speaking, the larger this number is, the wider the tyre will be.
Aspect Ratio is the ratio of the sidewall height to the section width. The sidewall height of the example tyre above is 60% of its section width.This number can be very indicative of a tyre's purpose. Lower numbers, like 55 or less, mean a short sidewall for improved steering response and better overall handling.
(R) Internal Construction
The "R" refers to radial construction, which has been the industry standard in passenger-car tyres for more than 20 years. Prior to radial tyres, most cars came with bias-ply tyres or X-ply tyres, which had a crude construction that made for poor handling. Bias-ply tyres (which use a "B" for their description) are still used for certain truck applications.
Rim or Wheel Diameter
Wheel Diameter specifies the size, in inches, of the wheel that a tyre fits. The example tyre will only fit a 14-inch wheel
Pay particular attention to this number if you plan on upgrading your wheel size. If your wheel diameter changes, you'll have to purchase a new set of tyres that matches this new diameter.
Other Tyre Markings
(82) Load Index
A tyre's load index is a measurement of how much weight each tyre is designed to support. The larger the number, the higher the load capacity. This is one of the most important numbers on your tyre. To find out what "82" means, it must be looked up on a Load-Carrying Capacity Per Tire chart above. Remember that this is per tyre, which means you have to multiply by four to get the total capacity for a complete set of tyres. If the vehicle has its original tyres, you can just refer to the doorjamb, which lists the maximum cargo capacity with passengers.
Some vehicles are equipped with "XL" tyres. No, it doesn't mean that they're extra large, but it does mean that they are extra-load tyres. The load index on these tyres is much higher than a standard-load tyre which is why it is important to replace an XL tyre with another XL tyre.
Remember "P-metric" and "Euro-metric sizing"? Their difference in load rating can lead to confusion and potential trouble. For a given size, P-metric tyres will have a load index that is one or two points lower than corresponding Euro-metric tyres. So if your car came with Euro-metric tyres, don't replace them with P-metric tyres. You can, however, replace P-metric tyres with equivalent-size Euro-metric ones because you gain load capacity that way.
Why is this important? Generally speaking, you don't want your replacement tyres to have a lower load index number than the originals (as indicated by the driver's doorjamb or the owner's manual), particularly with high-capacity vehicles that ride on smallish tyres, such as minivans.
Also, and contrary to popular perception, optional large-diameter wheels with lower-profile tyres tend to have less load-carrying capacity because they contain less air. And it is the volume of air inside the tyre, not the rubber itself or the wheel material that carries the load.
The load index is especially important when shopping for a tyre online, since many retailers do not specify whether a tyre is P-metric or not.
(H) Speed Rating
The speed rating is a measurement of the speed at which the tyre is designed to run for extended periods. An "H" speed rating signifies that this tyre can be run safely at speeds of up to 210 kph for extended periods. Will it explode if it goes to 220? No, not immediately. But it might if it is run at that speed for an extended time.
Listed above is a complete list of the various tyre speed ratings, and their associated letters.The "Z" rating used to be the highest rating for tyres having a maximum speed capability greater than 240 kph, but as tyre technology improved, it is was ultimately split into the "W" and "Y" rating. A "ZR" may sometimes appear in the size designation, as a sort of nod to the prior rating, but it will also be used in conjunction with a W or a Y.
The DOT code is used by the Department of Transportation (DOT) to track tyre production for recall purposes. If a tyre proves to be defective, this number helps keep track of where these tyres ended up so that buyers can be notified of the problem. At the end of the DOT code you'll find a four-digit number. This is the manufacturing date of the tyre. The first two digits stand for the week; the other two are the year. For example, if your tyre had "1610" listed, it was manufactured on the 16th week of 2010.
If you come across a three-digit number, you have a tyre that was manufactured before 2000. A DOT tyre code of "127" indicates the tire was made on the 12th week of the seventh year of the decade. But it's difficult to know whether that was 1997 or even 1987. According to official sources, some tyres produced in the 1990's may have a small triangle following the DOT number to identify the decade. But any tyre that has a three-digit code is history. Tyre experts recommend that tyres that are six or more years old be replaced, regardless of tread depth.
Sometimes the DOT number will be located on the inside of the tyre. In this case, you can either jack up the car to inspect it, or check with your local mechanic or tyre shop. You should also make a habit of checking the manufacturing date on your spare tyre as well.
Maximum Air Pressure
This number refers to the maximum amount of air you can put in a tyre before you harm it. It is not the recommended tyre pressure; that number can be found in your owner's manual and on the doorjamb. Remember that all tyre pressure readings are based on cold temperature and NOT whilst tyre is hot.
A traction rating can also be found on the sidewall of all modern tyres. It can be represented as AA, A, B or C. This is a rating of a tyre's traction when tested for straight-line braking on a wet surface. For this rating, AA signifies the best traction performance and C indicates the worst.
The temperature rating refers to the ability of the tyre to withstand heat under high speeds. The ratings, from best to worst, are: A, B and C.
Finally, you might find the word "TREADWEAR" on the sidewall followed by a number like 120 or 180. This is a rating of the tread's durability, as tested against an industry standard. The reference number is 100, so a tire with a treadwear rating of 200 has an 80 percent longer predicted tread life, while a rating of 80 means a predicted tread life only 80 percent as long as the industry standard.
In addition to all of the above, here is a comprehensive list of other markings you can find on your sidewall.
"Star": Original tyres for BMW
A/S: All-season tyre
A/T: All-terrain tyre
B: Bias construction, typically for motorcycles.
C: Commercial / passenger car tyre
BSW: Black SideWall
C: Commercial; tyres for light trucks. Similar to LT (below)
E4: Tyre approved according to ECE-regulations. See The E Mark below.
EL: Extra Load; tyre for vehicles of heavier standard weights
FR: Flange Rib - the area above the bead of the tyre that acts as a protection for the outer lip of your alloy wheel against light contact with kerbs etc.
H/T: Highway/terrain tyre. For SUVs and 4x4s - less aggressive than full off road tyres - design for some use on-road
LT: Light Truck tyres.
M0: Original tyres for Mercedes-Benz
M+S, or M&S: Mud and Snow - see car tyre types
Made in ...: Country of production
MFS: Max Flange Shield - a rubber ring around the tyre designed to help prevent damaging the wheel flange when close to a kerb
M/T: Mud/terrain tyre. Similar to A/TN(number): Original tyres for Porsche.
OWL: Outline White Lettering
P: Commercial / passenger car tyre
RB/RBL: Raised Black Lettering
RF: Reinforced tyres
RIB: A rubber ring around the tyre designed to help prevent damaging the wheel flange when close to a kerb. Same as MFSRW
RWL: Raised White Lettering
SFI, or Inner: Side Facing Inwards; inside of asymmetric tyres.
SFO, or Outer: Side Facing Outwards; outside of asymmetric tyres.
SL: Standard Load; tyre for normal usage and loads
SUV: SUV / 4x4 tyre
TT: Tube-type, tyre must be used with an inner-tube
TWI: Tread Wear Indicator.
WSW: White SideWall
XL: Extra Load; tyre for vehicles of heavier standard weights. Same as EL
Arrows: Denotes rotation direction for directional tread.
In addition (yes, there's more), these are what you'll find on run-flat tyres
DSST: Dunlop Self Supporting Technology
EMT: Goodyear Extended Mobility Tyre
RFT: Bridgestone Run Flat Tyre
ROF: Run On Flat
RSC: Runflat System Component
SSR: Continental Self Supporting Runflat
ZP: Michelin Zero Pressure
TPMS: Tyre Pressure Monitoring System