Winter / Snow Tire Tech

Original Equipment Tire Designations

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Since tires play such an important roll in establishing the personality of a vehicle, numerous vehicle manufacturers require their tire suppliers identify some or all of their Original Equipment (OE) tires with symbols or codes branded on the sidewalls that confirm the tire's original use.

The vehicle and tire manufacturer's goal is to make it easier for the owners to identify and select exact replacements when the Original Equipment tires wear out because matching the original tires exactly helps maintain the vehicle's intended personality.

Unfortunately many vehicles wear out tires in pairs (rather than sets of four) due to a lack of maintenance or when equivalent tread wear can't be achieved through periodic tire rotation. While it can't make up for performance differences due to tread depth, it is most important to match new tires to those originally used on the vehicle when replacing tires in pairs.

The following list provides the symbols or codes currently in use:

Make Vehicle Symbols/Codes
Aston Martin Some Vehicles A4A
AMS
AM2
AM8
AM9
AMR
AMX
Audi Some Vehicles A
AO
RO1
RO2
AOE (Reduced-Range Extended Mobility Tire)
Bentley Some Vehicles "B" in a circle
B
B1
BC
BL
BMW Some Vehicles 5-Pointed Star Symbol
Chrysler Some Dodge Vipers C1
Ferrari Some Vehicles F
K-1
K-2
General Motors All Vehicles TPC SPEC (Tire Performance Criteria Specification)
TPC SPEC 1156 M+S (All Season Tires)
TPC SPEC 1156 (Non All Season Tires)
Honda Acura NSX H-0 (H-Zero)
H-1 (H-One)
Hyundai Some Vehicles H
Jaguar Some Vehicles J
"J" in a circle
Lamborghini Some Vehicles L
Lotus Some Vehicles LTS
Maserati Some Vehicles MGT
McLaren All Vehicles MC
MC1
Mercedes Some Vehicles MO
MO1
MOE (Reduced-Range Extended Mobility Tire)
Mini Some Vehicles 5-Pointed Star Symbol
Porsche All Vehicles N-0 (N-Zero)
N-1 (N-One)
N-2 (N-Two)
N-3 (N-Three)
N-4 (N-Four)
N-5 (N-Five)
N-6 (N-Six)
Volkswagen Some Vehicles A
VO

The numerical escalation of Porsche N-Spec tires reflect either enhancements to the previous generation of the same tire model, or a change in the design specifications of a tire model used on a current Porsche vehicle to better complement the needs of a new Porsche vehicle.

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