New Hoosier wets at 1/2 price

[breakaway500]

Not all sizes availabe.. https://www.hoosiertire.com/discontinuedtires.htm

I know it won't rain this coming season,but just in case Sams magic doesn't work...

[John F]

You going to get a pair of the 315/35R17's for the front Mark?

[breakaway500]

I went with the 245's for the front of the Focus,and skis for the back..

[rousespointer]

Is a Hoosier size 285/645R18 close to a size 285/30ZR18? I can't remember how to convert the numbers? What does the -O mean on the list?

[dradernh]

Is a Hoosier size 285/645R18 close to a size 285/30ZR18? I can't remember how to convert the numbers? What does the -O mean on the list?

The 645 tells you the diameter of the tire, which is 25.4" (645mm / 25.4mm per inch = 25.4"). I don't know exactly how to calculate the aspect ratio from that data, but a call to Hoosier will get you squared-away in no time. My guess is that it's between 30 & 35.

[Chrispy]

Is a Hoosier size 285/645R18 close to a size 285/30ZR18? I can't remember how to convert the numbers? What does the -O mean on the list?

The 645 tells you the diameter of the tire, which is 25.4" (645mm / 25.4mm per inch = 25.4"). I don't know exactly how to calculate the aspect ratio from that data, but a call to Hoosier will get you squared-away in no time. My guess is that it's between 30 & 35.

The math is really ugly in the tire world thanks to the combination of metric and imperial measurements

But by my calculations the profile of 285/645R18 would be 33, so in the tire world it could be rated as either a 30 or a 35 profile.

A = ((Di - Ri) x 25.4) / (Wm x 2)

Where:
A = Aspect ratio
Di = Diameter in inches
Ri = Wheel radius in inches
Wm = Section width in mm


To go the other way:

Di = (Wm x A x 2 / 25.4) + R

[breakaway500]

^Very impressive,Chris!

[Chrispy]

Yep, 9th grade alegbra, LOL.

Wish I could remember the years that followed, I hear they taught us some cool stuff.

[CP]

225-245/45/R17 "Continental Grand Am Series Tires" for $147ea...what a damn DEAL! Ack, if only I could run these on my street car!