19.5" tires?
I've been reading that some folks have been buying 19.5" tires and I assume they are upgrading from a smaller tire. So I have 2 questions: 1) What is the difference between a 19.5" tire and a 18" ti...
Forum Discussion
SoCalDesertRider wrote:
Here is a formula to convert metric size to inches
Metric tire sizing, example-
225/70-19.5, where 225 is the section width in millimeters, 70 is the aspect ratio, expressed as a percentage of the section width, and 19.5 is the wheel diameter, expressed in inches.
To convert width, divide the section width by 25.4, which is the number of millimeters in an inch. Therefore, 225 / 25.4 = ~8.9", rounded to the nearest tenth of an inch.
To convert tire diameter, use-
2 x section width x aspect ratio / 2540 + wheel diameter
2540 is a constant in the equation
Example-
2 x 225 x 70 / 2540 = 12.4, + 19.5 = 31.9" diameter
Tire size converter
Those are generic sizes, what compares pretty loose in real life. For good tire size comparison you have to go to tire manufacturer site and find actuall RPM of specific tire model.
