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Tire Terminology:

A B C D E F G H I K L M N O P R S T U V W Z

   
M+S, M/S or M & S A tire sidewall designation indicating that the tire meets the RMA definition of a mud and snow tire.
McPherson Strut A front suspension assembly that combines the functions of the shock absorber, the upper steering pivot, and the wheel spindle in a single unit.
Mag A misleading description of specialty wheels; with exception of pure racing wheels, specialty wheels contain little or no magnesium.
Match Mounting A mounting procedure that matches the high point of a tire with the low point of its wheel. A dot or mark on the tire is matched with a dot, a sticker, or the valve hole on the wheel.
Metric Tire Size System A tire sizing system using the cross section in millimeters, aspect ratio, speed category, tire construction and the rim diameter in inches (e.g.: 185/70SR13).
Mounting Pad The surface area of the back of the wheel's center that contacts the brake drum or hub flange of the vehicle.
  N
Negative Camber A condition where the top of the tire is leaning inward from the tire's vertical centerline, as viewed from the top.
Negative Caster
A setting where the steering axis is inclined forward at the top as viewed from the side; a condition which tends to cause instability.
Negative Offset
When the back of the bolt pad is closer to the inside of the wheel; when the mounting face in inboard of the rim centerline; extends assembly away from vehicle resulting in wider tracking.
NHTSA
National Highway Traffic Safety Administration.
Nomenclature
Systematic naming of tire sizing systems.
Nominal
Tire dimensions figured from the actual numbers in the size.
Numeric System
A tire sizing system using tire cross section width and rim diameter in inches (e.g.: 7.35-14).
 

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