Altenzo Tyres Technical Details
We have compiled a short page that details some of the more common questions about the technical details regarding tyres. If you have any suggestions on content to include on this page please contacts
sales@altenzo.co.uk.
What Is A Speed Rating?
The speed rating of a tyres denotes the maxiumn speed that a tyres is rated to travel. This is always represented by a letter. Each letter corresponds to a different speed. See the below table to see what each letter means in MPH or KPM.
| Speed Rating |
Mile/Hour |
Kilometers/Hour |
|
Speed Rating |
Miles/Hour |
Kilometers/Hour |
| N | 87 | 140 | |
U | 124 | 200 |
| P | 93 | 150 | |
H | 130 | 210 |
| Q | 99 | 160 | |
V | 149 | 240 |
| R | 106 | 170 | |
Z | 150+ | 240+ |
| S | 112 | 180 | |
W | 168 | 270 |
| T | 118 | 190 | |
Y | 186 | 300 |
What Is A Load Index?
The load index of a tyre denotes the maxium weight that each tyre is rated to carry. This is tyipically represented by a number. Each number corresponds to a different weight. See the velow table to reference each load index to it's weight in KG.
| Load Index |
Load in kg |
| Load Index |
Load in kg |
| Load Index |
Load in kg |
| 62 |
265 |
| 84 |
500 |
| 106 |
950 |
| 63 |
272 |
| 85 |
515 |
| 107 |
975 |
| 64 |
280 |
| 86 |
530 |
| 108 |
1000 |
| 65 |
290 |
| 87 |
545 |
| 109 |
1030 |
| 66 |
300 |
| 88 |
560 |
| 110 |
1060 |
| 67 |
307 |
| 89 |
580 |
| 111 |
1090 |
| 68 |
315 |
| 90 |
600 |
| 112 |
1120 |
| 69 |
325 |
| 91 |
615 |
| 113 |
1150 |
| 70 |
335 |
| 92 |
630 |
| 114 |
1180 |
| 71 |
345 |
| 93 |
650 |
| 115 |
1215 |
| 72 |
355 |
| 94 |
670 |
| 116 |
1250 |
| 73 |
365 |
| 95 |
690 |
| 117 |
1285 |
| 74 |
375 |
| 96 |
710 |
| 118 |
1320 |
| 75 |
387 |
| 97 |
730 |
| 119 |
1360 |
| 76 |
400 |
| 98 |
750 |
| 120 |
1400 |
| 77 |
412 |
| 99 |
775 |
| 121 |
1450 |
| 78 |
425 |
| 100 |
800 |
| 122 |
1500 |
| 79 |
437 |
| 101 |
825 |
| 123 |
1550 |
| 80 |
450 |
| 102 |
850 |
| 124 |
1600 |
| 81 |
462 |
| 103 |
875 |
| 125 |
1650 |
| 82 |
475 |
| 104 |
900 |
| 126 |
1700 |
| 83 |
487 |
| 105 |
925 |
|
What Is The Treadwear Rating?
Treadwear grades are an indication of a tyre's relative wear rate.The higher the treadwear number is, the longer it should take for the tread to wear down.
A control tyre is assigned a grade of 100. Other tyres are compared to the control tyre. For example a tyre grade of 200 should wear twice as long as the control tyre. Of current tyres 15% are
rated below 200, 25% are rated 201-300, 32% are rated 301-400, 20% are rated 401-500, 6% are rated 501-600 and 2% are rated above 601.
What Is The Traction Rating?
Traction grades are an indication of a tyre's ability to stop on a wet road. A higher graded tyre should allow a car to stop on wet roads in a shorter distance than
a tyre with a lower grade. Traction is graded from highest to lowest as "AA", "A", "B", and "C". Of current tyres 3% are rated "AA", 75% are rated "A", 22% are rated "B" and only 1 line of tyres are rated "C".
What Is The Temperature Rating?
Temperature grades are an indication of a tyre's resistance to heat. Sustained high temperature ( for example, driving long distances in hot weather), can cause a tyre to deteriorate, leading to blowouts and tread separation.
From highest to lowest, a tyres resistance to heat is grade as "A", "B" or "C". Of current tyres 27% are rated "A", 59% are rated "B" and 11% are rated "C".
