Understanding Tire Construction  Aspect Ratio 

Aspect Ratio/Series Number  the height and width relationship of the tire. This number is determined by dividing a tire's section height by its section width. For example: the section height of G7014 is 70% of the section width Section Height  the the tire's section measured from the rim seat to the outer thread surface of an inflated tire. Cross Section  the linear distance between the exteriors of the sidewalls of an inflated tire. Bead  the specialized area of the tire designed to mate with the rim flange. Reinforced with steel cable on straight side tires.  Bead Seat  the horizontal surface of the rim where the bottom of the tire contacts the rim. Rim Diameter  the diameter of the rim at the bead seat. The most accurate method to determine the diameter is to measure the circumference of the rim at the bead seat and divide by (3.14) Tread Width  the portion of the tread design that comes in contact with the road surface. Overall Diameter  the linear distance between the exterior tread surface from the ground to the top of the tire. Load Capacity  the maximum weight a tire can support at its maximum inflation pressure (i.e. 1360 lbs @ 32 psi). 

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