Tire Speed Ratings vs. Wheel Center Bore
Comparing 2 standards across 14 specifications. 14 key differences identified.
Tire Speed Ratings (standardized under ISO 4000-1 and ECE Regulation 30) are alphabetical index symbols indicating the maximum sustained velocity a tire can safely maintain under its rated load capacity. Ranging from Q (160 km/h / 99 mph) for dedicated winter tires to V (240 km/h), W (270 km/h), Y (300 km/h), and (Y) (>300 km/h / >186 mph) for hypercars.
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 / UN ECE R30 / SAE J1561 | — |
|
Q Rating
|
160 km/h (99 mph) — Studded and studless Nordic winter tires | — |
|
S & T Ratings
|
S: 180 km/h (112 mph) | T: 190 km/h (118 mph) — Standard family sedans, minivans, and all-season tires | — |
|
H Rating (High Speed)
|
210 km/h (130 mph) — Touring sedans and premium crossovers | — |
|
V Rating
|
240 km/h (149 mph) — Sport compacts and performance GT cars | — |
|
W & Y Ratings
|
W: 270 km/h (168 mph) | Y: 300 km/h (186 mph) — Exotic sports cars and track-focused performance vehicles | — |
|
(Y) In Parentheses
|
Speeds in excess of 300 km/h (>186 mph) — Certified individually with vehicle manufacturer for hypercars (Bugatti, Koenigsegg, Porsche GT3 RS) | — |
|
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) |