Tire Size Conversion Chart
5/31/10 1:08 PMTire Tech - Tire Size Conversion Chart
Page 7 of 8http://clubs.hemmings.com/clubsites/chevylist/tech/tire_size_conversion.htm
30 1/2
P265/75R15 265/70R16 285/60R17 LT215/85R16 LT285/60R17 31X10.50R16.5LT 9.50R16.5LT
LT245/75R16 31X11.50R15LT
LT325/60R15 31X10.50R15LT
30 P255/70R16 P275/60R17
29 1/2
P245/70R16 265/60R17 LT225/75R16 30X9.50R15LT 8.75R16.5LT
7.00R15
29
205R16 255/65R16 255/55R18 LT235/75R15
205/80R16 P235/70R16 255/60R17
P235/75R15 P255/70R15
28 1/2
P225/75R15 P225/70R16 LT225/75R15 29X9.50R15LT 8.00R16.5LT
P245/70R15
28 215/70R16
P255/55R17
P275/60R15
27 1/2 P215/75R15 P225/70R15 LT215/75R15
27
P205/75R15 P215/65R16 255/50R17 LT205/75R15
P305/50R15
P255/60R15
26 1/2
P195/75R15 P225/70R14 P295/50R15 LT195/75R15 27X8.50R14LT
P245/60R15
26
P205/75R14 P215/65R15 P235/60R15
185R14 P215/70R14
25 1/2 P195/75R14 P205/70R14 P225/60R15
P-Metric and Euro Metric Sizing
What's the difference between the tire sizes of P225/60R16 and 225/60R16? The obvious answer is the "P"
in front of the first size, but just what does the "P" stand for and what does it tell us about the tires?
P-metric sized tires are the ones with the "P" at the beginning of the tire size, (such as P225/60R16 listed
above). They were introduced in the United States in the late 70s and are installed on vehicles primarily
used to carry passengers including cars, station wagons, sport utility vehicles and even light duty pickup
trucks. Their load capacity is based on an engineering formula which takes into account their physical size
(the volume of space for air inside the tire) and the amount of air pressure (how tightly the air molecules are
compressed). Since all P-metric sizes are all based on the formula for load, vehicle manufacturers can design
their new vehicles (weights and wheel well dimensions) around either existing or new tire sizes.
Metric or Euro metric sized tires are the ones without the "P" at the beginning, (such as 185R14 or the
225/60R16 listed above). Using metric dimensions to reflect a tire's width actually began in Europe in the
late 60s. However, since Euro metric sizes have been added over time based on the load and dimensional
requirements of new vehicles, the tire manufacturers designed many new tire sizes and load capacities
around the needs of new vehicles. Not quite as uniform as creating sizes using a formula, but they got the
job done.
Page 7/8
Free Download
Tire Size Conversion Chart PDF
Favor this template? Just fancy it by voting!
(0 Votes)
0.0
Related Forms
