Tire Terminology

• Section height is the design height of a tire section measured from the base of the tire bead to the top of the tread.
• Section width is the width of a new tire, including 24-hour inflation growth and normal sidewalls, but not including protective side ribs, bars, or decorations.
• Aspect ratio is the section height divided by section width, and is measured as a percentage.
• Static loaded radius (SLR) is the dimension measured from the axle centerline to the ground when the tire is under load. SLR is usually specified at the tire's maximum load and inflation for that particular tire.
• Overall diameter is twice the section height of a new tire, including 24-hour inflation growth, plus the nominal rim diameter.

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