April 29th, 2016
There are numerous other markings on a typical tire, these may include:
- M+S, or M&S: Mud and Snow; A tire that meets the Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC) all-season tire definition. These are all-weather tires, with self-cleaning tread and above-average traction in muddy or very light snowy conditions, and for low ambient temperatures. Spike tires have an additional letter, "E" (M+SE).
- Mountain Snowflake Pictograph: Winter passenger and light truck tires that meet the severe snow service requirements of Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC).
- BSW: Black Sidewall
- WSW: White Sidewall
- OWL: Outline White Lettering
- ORWL: Outlined Raised White Lettering
- RWL: Raised White Lettering
- VSB: Vertical Serrated Band
- BSL: Black Serrated Letters
- E4: Tire approved according ECE-regulations, the number indicating the country of approval.
- DOT Code: All tires for use in the USA have a Department Of Transportation (DOT) code. It specifies the company, factory, mold, batch, and date of production (two digits for week of the year plus two digits for year).
- TL: Tubeless
- TT: Tube-type, tire must be used with an inner-tube
- Made in...: Country of production
- SFI, or Inner: Side Facing Inwards; inside of asymmetric tires
- SFO, or Outer: Side Facing Outwards; outside of asymmetric tires
- SL: Standard Load; tire for normal usage and loads
- XL: Extra Load; a tire that allows a higher inflation pressure than a Standard Load tire, which increases the tire's maximum load.
- Arrows: Some tread designs are "directional", and designed to perform better when driven in a specific direction (clockwise or counter-clockwise). Such tires will have an arrow showing which way the tire should rotate when the vehicle is moving forwards. It is important not to put a "clockwise" tire on the left hand side of the car or a "counter-clockwise" tire on the right side.
Posted in: Tire Basics