Tire sizes: difference between 155/80R13 and 155R13?
 

On Sunday, February 28, 1993 at 3:21:21 PM UTC-8, Nemo wrote:
> I know in "155/80R13", '155' is the tread width in mm, '80' the aspect
> ratio and '13' the wheel size in inch. But how come sometimes the aspect
> ratio is omitted? Does that mean "aspect ratio not important", or maybe
> in smaller tires (I've only noticed this omission in smaller tires) the
> aspect ratio doesn't vary much? Thanks for enlightening me - I have
> looked into all kinds of car books, and the FAQ here, and never found
> an explanation for this.

I have a Austin Healey from1961 It has 155R13 tires Paul