Outside tire wear?

[Calabria]

Ive had my tires (Sumitomo HTR Z3) for about 3-4 months now. Ive notice the outside of tires are wearing faster then anywhere else on my trear...ive also noticed at about 70-85mph my car shakes. Making me think that my alignment is most likely off. Suggestions

[Doc@tirerack]

Yep, check alignment and possibly have tires Road Force balanced.