Tire School

LOAD INDEX, SPEED INDEX, and LOAD RANGE

Load Index

Tires are specified by the manufacturer with a maximum load rating. Loads exceeding the rating can result in unsafe conditions that can lead to steering instability and even rupture. The load index refers to the load-carrying capacity of a tire, or how much weight a tire can support. For example, if a tire has a load index of 89, it can support 580kgs (from below chart) at maximum air pressure.

LIKGLIKGLIKGLIKGLIKGLIKGLIKG
0454014080450120140016045002001400024045000
146.24114581462121145016146252011450024146250
247.54215082475122150016247502021500024247500
348.74315583487123155016348752031600024348750
4504416084500124160016450002041600024450000
551.54516585515125165016551502051650024551500
6534617086530126170016653002061700024653000
754.54717587545127175016754502071750024754500
8564818088560128180016856002081800024856000
9584918589580129185016958002091850024958000
10605019090600130190017060002101900025060000
1161.55119591615131195017161502111950025161500
12635220092630132200017263002122000025263000
13655320693650133206017365002132060025365000
14675421294670134212017467002142120025467000
15695521895690135218017569002152180025569000
16715622496710136224017671002162240025671000
17735723097730137230017773002172300025773000
18755823698750138236017875002182360025875000
1977.55924399775139243017977502192430025977500
208060250100800140250018080002202500026080000
2182.561257101825141257518182502212575026182500
228562265102850142265018285002222650026285000
2387.563272103875143272518387502232725026387500
249064280104900144280018490002242800026490000
2592.565290105925145290018592502252900026592500
269566300106950146300018695002263000026695000
2797.567307107975147307518797502273075026797500
2810068315108100014831501881000022831500268100000
2910369325109103014932501891030022932500269103000
3010670335110106015033501901060023033500270106000
3110971345111109015134501911090023134500271109000
3211272355112112015235501921120023235500272112000
3311573365113115015336501931150023336500273115000
3411874375114118015437501941180023437500274118000
3512175387115121515538751951215023538750275121500
3612576400116125015640001961250023640000276125000
3712877412117128515741251971285023741250277128500
3813278425118132015842501981320023842500278132000
3913679437119136015943751991360023943750279136000
Speed Rating
The speed rating denotes the maximum speed at which a tire is designed to be operated.

symbol

Speed (km/h)symbolSpeed (km/h)
A15K110
A210L120
A315M130
A420N140
A525P150
A630Q160
A735R170
A840S180
B50T190
C60U200
D65H210
E70V240
F80W270
G90Y300
J100ZR240+
Load Range
Load Range Designation-Ply Rating Equivalency Table:
Load RANGEPLY-RATING
A2
B4
C6
D8
E10
F12
G14
H16
J18
L20
M22
N24
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