Originally Posted By: bubbatime
Originally Posted By: redhat
So... my conclusion now is that a metric tire size 215/60/16 measures different parts of a tire as compared to a 26x10.5-15.
215/60/16
-tread width is 215MM
-tires sidewall height from the rim to the tread is 60% of the tread width (215mm x 60% = 129MM tall sidewall
-rim diameter is 16 inches
-to get the tire diameter, add the rim size (16) plus the sidewall height times two (16 inches plus 258mm (10.15 inches)
-215/60/16 is a 26.15/8.46/16 tire
-26.15 inches tall, 8.46 inch wide tread, 16 inch rim
Actually, 215 is the section width in millimeters. The tread width is less. The rest is correct. The second number is known as the aspect ratio which, as stated, is the percentage of height to width. 1 inch=25.4mm