On 2017-07-06, Chaya Eve wrote:
Is it normal for the outside edges of the front tires to be stairstepping
on the outer inch or two only?

It's called "cupping" or "scalloping". Usta be common ona lotta older
motorcycle tires (Dunlap K70's). Never seen it on a car tire,
but, here is a link:

http://www.procarcare.com/includes/content/resourcecenter/encyclopedia/ch25/25readtirewear.html

nb