Post by tweedles on Jun 20, 2004 19:55:03 GMT -5
In the metric tire sizing method, the sizing breaks down as follows:
Using 325/75R16 as an example, the 325 represents the section width in millimeters. The 75 is the percentage of sidewall hieght to section width (aka aspect ratio) and the 16 is the rim diameter in inches.
With our 325/75R16, the conversion to inches would be as follows:
1) Divide the section width by 304.8, then mutiply by 12. This gives us the section width is inches.
325/304.8x12= 12.8"
2) Multiply the section width by the aspect ratio to give us the sidewall hieght.
12.8x0.75= 9.6"
3) Multiply the sidewall height by 2 and add the rim diameter.
9.6x2= 19.2
19.2+16= 35.2
Using the example, a 325/75R16 would be approximatly the same size as a 35-12.5 R16. This sizing can be off just like a 31-10.5-15 can actually be 30" tall.
To convert a regular tire size to metric, you simply reverse the process.
Using 325/75R16 as an example, the 325 represents the section width in millimeters. The 75 is the percentage of sidewall hieght to section width (aka aspect ratio) and the 16 is the rim diameter in inches.
With our 325/75R16, the conversion to inches would be as follows:
1) Divide the section width by 304.8, then mutiply by 12. This gives us the section width is inches.
325/304.8x12= 12.8"
2) Multiply the section width by the aspect ratio to give us the sidewall hieght.
12.8x0.75= 9.6"
3) Multiply the sidewall height by 2 and add the rim diameter.
9.6x2= 19.2
19.2+16= 35.2
Using the example, a 325/75R16 would be approximatly the same size as a 35-12.5 R16. This sizing can be off just like a 31-10.5-15 can actually be 30" tall.
To convert a regular tire size to metric, you simply reverse the process.
