Left Front tire wears twice as fast as Right

Hi all --

As the subject implies, I noticed that the left front tire on my 1924 Franklin has been wearing about twice as fast as the right front. I've since rotated the two tires to even out the wear. The car has rear wheel brakes only.

The question is why did this happen?

--The tires are Firestone 5.00 x 23 (23-inch rim).

--The toe-in was checked to be within factory specs at 1/4-inch

--The tire wear is even across the tire with no cupping or scuffing.

--I run tire pressures around 27 pounds to avoid excess wear in the center of the tire because this is a light weight car.

--I do alot of driving on highly crowned country roads so I'm constantly "steering" to the left to stay straight. But why would this wear only the left front?

Other than this, the car steers easy and straight with no pull to either side on a flat or non-crowned road. Rear tires are wearing evenly.

I'm pretty much at a loss for a good explanation. Ideas welcome.

--Scott

Hi Scott -

You might try 1/16" of toe-in. With any appreciable wear in the front end, springs, etc, funny things happen to alignment when loading the steering constantly, such as running crowned roads. 1/4" is the factory maximum but not necessarily ideal - and this is when all was in new condition. Less toe-in might be much better...

tom