"Saigoncal1" <saigoncal1@aol.comspamoff> wrote in message
news:20031009134138.14985.00000031@mb-m02.aol.com...
> >I'm as newbie as they come, but someone posted a couple of links the
> >other day that might help you out. Here ya go:
> >
> >http://www.800-923-jeep.com/techCorner/tire_fitment.cfm
> >http://www.tirerack.com/tires/surveyresults/orat.jsp
>
> Okay, everyone.. I've got another newbie question for you.. how do these
30",
> 31", 32" etc sizes related to 215, 225, 235 etc sizes?

The 235 etc. number is the width of the tire in millimeters.

The 60, 70, 75 is the aspect ratio, which is the ratio of the height of the
sidewall to the width of the tire. This needs a decimal point in front of
it, so 70 ratio = .70.

To calculate the tire size convert the width to inches by dividing by 25.4
(235/25.4 = 9.252)

To calculate the sidewall height, multiply the width by the aspect ratio.
(9.252*.70 = 6.476)

The tire height is the rim diameter plus two sidewalls. (6.476*2 + 15 =
27.95)

you can also go the other way:

To convert a 35" x 12.5 x 15" tire to metric:

Take the width and multiply it by 25.4 (12.5*25.4 = 317.5) This tire would
be designated a 315

The sidewall height is (35-15)/2 which is 10"

The aspect ratio is sidewall height divided by width, so 10/12.5 which would
be .80 or an 80 series tire.

So this tire would be designated as a 315/80R15. The R designates radial.

and if all that confuses you, here are online converters:

http://www.s-series.org/htm/calc/tiresizeconv.htm
http://www.csgnetwork.com/lttrucktireinfocalc.html

HTH
Chris

 

"Saigoncal1" <saigoncal1@aol.comspamoff> wrote in message
news:20031009134138.14985.00000031@mb-m02.aol.com...
> >I'm as newbie as they come, but someone posted a couple of links the
> >other day that might help you out. Here ya go:
> >
> >http://www.800-923-jeep.com/techCorner/tire_fitment.cfm
> >http://www.tirerack.com/tires/surveyresults/orat.jsp
>
> Okay, everyone.. I've got another newbie question for you.. how do these
30",
> 31", 32" etc sizes related to 215, 225, 235 etc sizes?

The 235 etc. number is the width of the tire in millimeters.

The 60, 70, 75 is the aspect ratio, which is the ratio of the height of the
sidewall to the width of the tire. This needs a decimal point in front of
it, so 70 ratio = .70.

To calculate the tire size convert the width to inches by dividing by 25.4
(235/25.4 = 9.252)

To calculate the sidewall height, multiply the width by the aspect ratio.
(9.252*.70 = 6.476)

The tire height is the rim diameter plus two sidewalls. (6.476*2 + 15 =
27.95)

you can also go the other way:

To convert a 35" x 12.5 x 15" tire to metric:

Take the width and multiply it by 25.4 (12.5*25.4 = 317.5) This tire would
be designated a 315

The sidewall height is (35-15)/2 which is 10"

The aspect ratio is sidewall height divided by width, so 10/12.5 which would
be .80 or an 80 series tire.

So this tire would be designated as a 315/80R15. The R designates radial.

and if all that confuses you, here are online converters:

http://www.s-series.org/htm/calc/tiresizeconv.htm
http://www.csgnetwork.com/lttrucktireinfocalc.html

HTH
Chris

 

"Saigoncal1" <saigoncal1@aol.comspamoff> wrote in message
news:20031009134138.14985.00000031@mb-m02.aol.com...
> >I'm as newbie as they come, but someone posted a couple of links the
> >other day that might help you out. Here ya go:
> >
> >http://www.800-923-jeep.com/techCorner/tire_fitment.cfm
> >http://www.tirerack.com/tires/surveyresults/orat.jsp
>
> Okay, everyone.. I've got another newbie question for you.. how do these
30",
> 31", 32" etc sizes related to 215, 225, 235 etc sizes?

The 235 etc. number is the width of the tire in millimeters.

The 60, 70, 75 is the aspect ratio, which is the ratio of the height of the
sidewall to the width of the tire. This needs a decimal point in front of
it, so 70 ratio = .70.

To calculate the tire size convert the width to inches by dividing by 25.4
(235/25.4 = 9.252)

To calculate the sidewall height, multiply the width by the aspect ratio.
(9.252*.70 = 6.476)

The tire height is the rim diameter plus two sidewalls. (6.476*2 + 15 =
27.95)

you can also go the other way:

To convert a 35" x 12.5 x 15" tire to metric:

Take the width and multiply it by 25.4 (12.5*25.4 = 317.5) This tire would
be designated a 315

The sidewall height is (35-15)/2 which is 10"

The aspect ratio is sidewall height divided by width, so 10/12.5 which would
be .80 or an 80 series tire.

So this tire would be designated as a 315/80R15. The R designates radial.

and if all that confuses you, here are online converters:

http://www.s-series.org/htm/calc/tiresizeconv.htm
http://www.csgnetwork.com/lttrucktireinfocalc.html

HTH
Chris