What Tire Size Replaces an Old A78-13 Tire Size

Updated 07/06/2015 | Published 07/03/2015

Question:

ON A 1974 SPITFIRE. replacement size

asked by: BOB

Helpful Expert Reply:

The modern metric equivalent to tire size A78-13 is going to be a 175/80-13. You won't be able to use any of the tires we carry though because they are for trailer use only.

There is a difference between the way trailer tires are manufactured versus passenger vehicle tires. Trailer tires are built with a thicker sidewall to handle more vertical load. Passenger tires are built for cornering more with lateral forces in mind.

expert reply by: Michael H