Tire Load Index vs. Wheel Center Bore
Comparing 2 standards across 14 specifications. 14 key differences identified.
The Tire Load Index (standardized under ISO 4000-1) is a numerical code assigned to a passenger or commercial tire indicating the maximum physical weight (in kilograms and pounds) the tire can carry when inflated to its maximum operating cold tire pressure. Spanning Load Index 70 (335 kg / 739 lb) to Load Index 120 (1400 kg / 3086 lb) per tire.
The Wheel Center Bore (measured in millimeters to 0.1 mm precision) is the machined center opening on the back of a wheel designed to fit snugly over the vehicle's raised wheel hub snout. Ensuring the wheel is mounted 'hub-centrically' (bearing vehicle weight on the center hub collar rather than the lug bolts), preventing high-speed vibrations.
Specification Comparison Table
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
ISO 4000-1 / ETRTO / TRA Load Tables | — |
|
Standard Load (SL) Pressure
|
Calibrated at 2.5 bar (36 psi) cold inflation pressure for passenger car tires | — |
|
Extra Load (XL / Reinforced)
|
Reinforced internal carcass calibrated at 2.9 bar (42 psi) for heavy electric vehicles (EVs) and SUVs | — |
|
Common Passenger Load Indices
|
LI 82: 475 kg (1,047 lb) | LI 88: 560 kg (1,235 lb) | LI 91: 615 kg (1,356 lb) | LI 95: 690 kg (1,521 lb) | — |
|
Heavy EV & SUV Load Indices
|
LI 100: 800 kg (1,764 lb) | LI 104: 900 kg (1,984 lb) | LI 108: 1,000 kg (2,205 lb) | LI 112: 1,120 kg (2,469 lb) | — |
|
Vehicle Axle Calculation
|
Sum of two tire load capacities on an axle must exceed the Gross Axle Weight Rating (GAWR) | — |
|
HL (High Load) EV Benchmark
|
New standard for heavy battery packs carrying higher load at equivalent tire volume and pressure | — |
|
Hub-Centric Engineering Function
|
— | Center hub collar centers the wheel with zero eccentricity and supports vehicle radial shear loads |
|
Volkswagen / Audi (VAG MQB)
|
— | 57.1 mm center bore (VW Golf, Jetta, GTI, Audi A3, TT) |
|
Audi / Mercedes-Benz / BMW G-Chassis
|
— | 66.6 mm / 66.56 mm center bore (Audi A4/A6/S4 MLB platform, Mercedes C/E-Class, modern BMW) |
|
BMW Classic (E & F Chassis)
|
— | 72.6 mm (standard BMW hub) | BMW E39 5-Series exception: 74.1 mm |
|
Subaru / Toyota GT86
|
— | 56.1 mm center bore |
|
Honda / Acura / Nissan
|
— | 64.1 mm (Honda/Acura) | 66.1 mm (Nissan/Infiniti) | 60.1 mm (Toyota standard) |
|
Hub-Centric Rings (Spigot Rings)
|
— | Machined aluminum or polycarbonate adapter rings (e.g. 73.1mm aftermarket wheel bore -> 57.1mm VW hub) |