Tyre Specifications Explained:


Spec Tables


Each spec table in our catalogue lists the standard specifications of a tyre, including size, tread-depth, speed rating etc etc.

Example:

SizeTDODRIMPRLI SRLI(Kg)KPA 
255/70R22.5 14 930 7.50 16 140/37 L 2500/2300 830

  Size Code: 255/70R22.5

255Tyre width in millimeters
70Profile = % of sidewall height vs width
RRadial construction
22.5Rim Diameter in inches
or...
SizeTDODRIMPRLI SRLI(Kg)KPA 
9.5R17.5 14 930 7.50 16 140/37 L 2500/2300 830

  Size Code: 9.5R17.5

9.5Tyre width in inches
RRadial construction
17.5Rim Diameter in inches

 Codes:

CODEDESCRIPTIONNotes
TD TREAD DEPTH The tread depth is specified in millimetres.
OD OVERALL DIAMETER This is the overall diameter of the tyre, when fitted, it is the sum of the rim diameter + 2 * tyre sidewall height. The sidewall height can be calculated from the profile value and tyre width value as specified in it's size.
RIM RIM SIZE The width (in inches) across the the rim - where the tyre beads sit. Generally a given rim width will fit several tyre "sizes" i.e. tread widths, but it is better if the tread width is narrower than the rim size.
PR PLY RATING In the old days this represented the actual number of layers of rubber/cotton used in the construction of the tyre, more plies = more strength = more load carrying capacity. Typical truck tyres today will have ply ratings between 16 and 20, but in fact only have around 5 plies or layers.
LI LOAD INDEX The load index is a numeric code indicating the maximum load a tyre can carry for the speed it is rated at (see speed rating). Load index values range from 0 to 279, representing weight capacities from 45kg up to 136 Tonnes. The higher the Load Index value the greater the load the tyre can carry. The first, higher value is for a single tyre, the second lower value is for "twinned" tyres. See the table at the bottom of this page for full load index values.
SR SPEED RATING Maximum safe speed the tyre should be driven at, see the speed rating table below for specific values.
LI(KG) LOAD CAPACITY The actual load (in Kgs) that the tyre is rated to carry -
KPA TYRE PRESSURE The recommended tyre pressure to operate the tyre at.

Speed ratings:

RATINGKPHRATINGKPHRATINGKPHRATINGKPH
E70 L120 R170 V240
F80 M130 S180 WZR270
G90 N140 T190 YZR300
J100 P150 U200 (Y)ZR300
K110 Q160 H210



Load Index Tables:


LIKgLIKgLIKg
045 40140 80450
146.5 41145 81462
247.5 42150 82475
348.7 43155 83487
450 44160 84500
551.5 45165 85515
653 46170 86530
754.5 47175 87545
856 48180 88560
958 49185 89580
1060 50190 90600
1161.5 51195 91615
1263 52200 92630
1365 53206 93650
1467 54212 94670
1569 55218 95690
1671 56224 96710
1773 57230 97730
1875 58236 98750
1977.5 59243 99775
2080 60250 100800
2182.5 61257 101825
2285 62265 102850
2387.5 63272 103875
2490 64280 104900
2592.5 65290 105925
2695 66300 106950
2797.5 67307 107975
28100 68315 1081000
29103 69325 1091030
30106 70335 1101060
31109 71345 1111090
32112 72355 1121120
33115 73365 1131150
34118 74375 1141180
35121 75387 1151215
36125 76400 1161250
37128 77412 1171285
38132 78425 1181320
39136 79437 1191360
LIKgLIKgLIKg
1201400 1604500 20014000
1211450 1614625 20114500
1221500 1624750 20215000
1231550 1634875 20315500
1241600 1645000 20416000
1251650 1655150 20516500
1261700 1665300 20617000
1271750 1675450 20717500
1281800 1685600 20818000
1291850 1695800 20918500
1301900 1706000 21019000
1311950 1716150 21119500
1322000 1726300 21220000
1332060 1736500 21320600
1342120 1746700 21421200
1352180 1756900 21521800
1362240 1767100 21622400
1372300 1777300 21723000
1382360 1787500 21823600
1392430 1797750 21924300
1402500 1808000 22025000
1412575 1818250 22125750
1422650 1828500 22226500
1432725 1838756 22327250
1442800 1849000 22428000
1452900 1859250 22529000
1463000 1869500 22630000
1473075 1879750 22730750
1483150 18810000 22831500
1493250 18910300 22932500
1503350 19010600 23033500
1513450 19110900 23134500
1523550 19211200 23235500
1533650 19311500 23336500
1543750 19411800 23437500
1553875 19512150 23538750
1564000 19612500 23640000
1574125 19712850 23741250
1584250 19813200 23842500
1594375 19913600 23943750
LIKg
24045000
24146250
24247500
24348750
24450000
24551500
24653000
24754500
24856000
24958000
25060000
25161500
25263000
25365000
25467000
25569000
25671000
25773000
25875000
25977500
26080000
26182500
26285000
26387500
26490000
26592500
26695000
26797500
268100000
269103000
270106000
271109000
272112000
273115000
274118000
275121000
276125000
277128500
278132000
279136000





© 2018 Wholesale Tyres NZ Limited.
TERMS OF USE  |  PRIVACY POLICY  |  
Website engineered by Compliant