Such tires will have an arrow showing which way the tire should rotate when the vehicle is moving forwards. B: Bias belted; tires for motorcycles (Example: 150/70 B 17 69 H) – diagonal construction with belt added under the tread BSB: Broken serrated band BSL: Black serrated letters BSW: Black sidewall C: Commercial; tires for light trucks (Example: 185 R14 C) DOT code: All tires for use in the USA have the DOT code, as required by the Department of Transportation (DOT). It specifies the company, factory, mold, batch, and date of production (two digits for week of the year plus two digits for year; or two digits for week of the year plus one digit for year for tires made prior to 2000).