Tires codes


Tires are usually named with a series of codes. For example, one of the recommended tires for Vanagons is the 'Yohohama Y356 LT 195/75 R14 (load range D)'. The latter part of this (195/75 R14) is a uniform code assigned to tires. This section tells you how to intepret this code.

Speed Rating

Sustained speed rating is designated by a letter code. Vanagons require a minimum speed rating of 'R'. (Don't be confused with 'R', though. In '195/75 R14', the 'R' is means 'radial' and is not a speed rating.)

    Q
      99 mph   160 kph
    R   106 mph   170 kph
    S
      112 mph   180 kph
    T   118 mph   190 kph
    U
      124 mph   200 kph
    H
      130 mph   210 kph
    V   149 mph   240 kph
    W       270 kph
    Y       300 kph
    Z
      149+ mph   240+ kph

(I'm not sure why 'H' is in there, except that some person thought it would be cool if 'H' stood for 'high speed'.)

Tire widths

Wheel diameters are usually in inches and tire width in millimeters or a letter designation. In our example of '195/75 R14', '195' is the tire width in millimeters, and '14' is the wheel diameter in inches.

    mm letter inches
    80 MH 3.00
    90 MJ 3.25
    100 ML 3.50
    110 MM 4.00
    120 MP 4.50
    130 MT 5.00
    140 MU 5.50
    150 MV 6.00

Shoulder heights

The shoulder height is stated as a percentage of the tire width. For example, in '195/75 R14', the shoulder height is 75% of the tire width (195mm), or 146.25mm.

Load index

The load-index figure denotes the maximum load capacity of a tire when driven at maximum speed. Note that you have four tires, so you should multiply the load index value by approximately 4.

Vanagons & Syncros need a load rating of at least 97, while Syncro 16" need a load rating of 104.

    Load index
    kg
    Load index
    kg
    Load index
    kg



    65
    290
    83
    487
    101
    825
    66
    300
    84
    500
    102
    850
    67
    307
    85
    515
    103
    875
    68
    315
    86
    530
    104
    900
    69
    325
    87
    545
    105
    925
    70
    335
    88
    560
    106
    950
    71
    345
    89
    580
    107
    975
    72
    355
    90
    600
    108
    1000
    73
    365
    91
    615
    109
    1030
    74
    375
    92
    630
    110
    1060
    75
    387
    93
    650
    111
    1090
    76
    400
    94
    670
    112
    1120
    77
    412
    95
    690
    113
    1150
    78
    425
    96
    710
    114
    1180
    79
    237
    97
    730
    115
    1215
    80
    450
    98
    750
    116
    1250
    81
    462
    99
    775
    117
    1285
    82
    475
    100
    800
    118
    1320
    119
    1360

Miscellaneous codes

    P Passenger
    LT Light Truck
    R Radial
    B Belted

Tire Diameters

  1. What is the diameter of a tire?

    Here's a table of tire diameters by width and profile, for your speedometer correction calculations. Eurotire, a nice-to-deal-with tire distributor in NJ, used to include this info and more in their catalogs.

      14 inch wheels:
      80 75 70 65 60 55
      165 622 --- --- --- --- ---
      175 634 --- 606 --- --- ---
      185 650 631 624 596 578 ---
      195 --- 651 636 605 590 ---
      205 --- --- 652 --- 602 582
      215 --- --- 665 --- --- ---
      225 --- --- --- --- 626 604
      245 --- --- --- --- 650 ---

      15 inch wheels:
      80 75 70 65 60 55
      165 646 --- --- --- --- ---
      175 660 --- 632 --- --- ---
      185 674 --- 648 621 --- ---
      195 --- --- 656 635 615 ---
      205 --- 681 669 647 627 607
      215 --- 692 682 661 639 ---
      225 --- 694 --- --- --- ---
      235 --- --- --- --- 663 639
      265 --- --- --- --- 687 ---

    Diameters are in millimeters, with tire installed on narrowest rims approved for that tire size. Wider rims would give slightly smaller diameter.

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