Tools

Tire Size Calculator

Use this quick tool to figure out how changing tire/wheel sizes will affect the overall diameter of your wheels which could affect your speedometer.

Porsche Wheel/Tire Weight Info Database

This is a database of Porsche Tires and Wheels with weights of each. Use this to determine how your unsprung weight will change when you change tires or wheels. This site seems to be down. Does anyone have a current link?