newbe tire size question
#1
newbe tire size question
why do people use different #s on tire sizes? for example
265 70 17 i know fiest is how wide, second tall, and third is rim
and 31"" tires or what ever.
and how can you tell exactly what size a 31" - 38" tire is in the 295 85 17 way?
if that makes any sence.
can some one please explain the mathmatical portion of the problem? thanks mike
265 70 17 i know fiest is how wide, second tall, and third is rim
and 31"" tires or what ever.
and how can you tell exactly what size a 31" - 38" tire is in the 295 85 17 way?
if that makes any sence.
can some one please explain the mathmatical portion of the problem? thanks mike
#2
metric sizes are designated as
width in millimeters & aspect ratio (as a % of width) & rim diameter
inch sizes are designated as
diameter of tire (height) & width of tire & rim diameter
They are related by math as follows:
1. to obtain the width of an inch tire in mm (metric)
width in inches * 25.4
2. to obtain the aspect ratio of the corresponding metric tire size from an inch sized tire
aspect ratio = (inch height - rim diameter) / [ 2 * (width in inches ) ]
3. The rim is measued in inches in almost every case for both metric and inch sized tire designations.
LT31x10.50R16 is about an LT265/70R16
LT33x12.50R16 is about an LT315/70R16 (I think most are called an LT305/70R16)
LT35x12.50R16 is about an LT315/75R16
LT38x15.50R15 is about an LT390/75R15
width in millimeters & aspect ratio (as a % of width) & rim diameter
inch sizes are designated as
diameter of tire (height) & width of tire & rim diameter
They are related by math as follows:
1. to obtain the width of an inch tire in mm (metric)
width in inches * 25.4
2. to obtain the aspect ratio of the corresponding metric tire size from an inch sized tire
aspect ratio = (inch height - rim diameter) / [ 2 * (width in inches ) ]
3. The rim is measued in inches in almost every case for both metric and inch sized tire designations.
LT31x10.50R16 is about an LT265/70R16
LT33x12.50R16 is about an LT315/70R16 (I think most are called an LT305/70R16)
LT35x12.50R16 is about an LT315/75R16
LT38x15.50R15 is about an LT390/75R15