GC: Tire Circumference field

This field contains the calculated rear tire circumference using the stock tire Width, Aspect and Rim. Because not all tires actually have this calculated size, you can enter the size your rear tire actually has. If you do that, the field 'Aspect (%) will be recalculated and updated to reflect correct Aspect using your circumference and entered Width and Rim.

Tire sizes differ because of:

• production tolerances,
• tire pressure
• tire temperature
• thread wear
• and rotation speed (High speeds make the tire bigger)

By manually entering your tire circumference you can compensate for all that and have a more accurate result.
More on how to measure your tire circumference in the Help files: Menu / Tech Info / Tire Circumference.

Make sure to use the correct units 'Inch' or 'mm' depending on the selected drop down value 'Imperial' or Metric'.