TireSize.NET

Tire sizes and terminology, at a glance.

Tire size calculation and a glossary of tire terminology (rim width, aspect ratio, air pressure, load index).

• Rim Width — Wheel width in inches, and what J / JJ mean
• Aspect Ratio — Ratio of section height to section width (%)
• Air Pressure — Recommended pressure, measurement tips, pencil gauges
• Load Index — Maximum load capacity index (translation pending)