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  2. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    As an example, if a tire size has two sets of numbers (6-12, 5.00-15, 11.2-24), then the first number (5.00-15) is the approximate width in inches, and the second number (5.00-15) is the rim diameter in inches. If a tire size has three sets of numbers (15x6.00-6, 26x12.00-12, 31x15.50-15), then the first number (26x12.00-12) is the approximate ...

  3. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall expressed as a percentage of the nominal tire width.

  4. Plus sizing - Wikipedia

    en.wikipedia.org/wiki/Plus_sizing

    The number following the "plus" describes the number of inches which is added to the diameter of the rim. For example, plus one sizing means increasing the wheel by 1 inch (25 mm) – i.e. from a 15 to 16 in (380 to 410 mm) rim size. A "plus zero" upgrade means changing to a wider tire size while using the same diameter wheel.

  5. Speedometer - Wikipedia

    en.wikipedia.org/wiki/Speedometer

    In the case of wear, a new "185/70R14" tire of 620 mm (24.4 inch) diameter will have ≈8 mm tread depth, at legal limit this reduces to 1.6 mm, the difference being 12.8 mm in diameter or 0.5 inches which is 2% in 620 mm (24.4 inches).

  6. Bolt circle - Wikipedia

    en.wikipedia.org/wiki/Bolt_circle

    Some of the most common bolt circle diameters on modern cars are 100 mm, 112 mm and 114.3 mm. [citation needed] The bolt circle of a car is one of several parameters that must be checked before buying new rims to make sure they will fit the car (along with wheel offset, hub diameter, and finally the diameter and width of the rim and tire). Over ...

  7. Mack R series - Wikipedia

    en.wikipedia.org/wiki/Mack_R_series

    A “6” was for the 672 cu in (11.0 L) I6, “9” was for the 998 cu in (16.4 L) V8, in 1987 the "7” 728 cu in (11.9 L) I6 was introduced. The next three digits were the horsepower rating of the engine, and an “L” suffix indicated an "Econodyne" low speed model.