treadwear of 400 for one tire is different on another. treadwear ratings are based upon a designated tire for BRAND A, usually their worst wearing tread. So whats 400 for say Goodyear wouldnt necessarily be the same for Sumitomo, beings that the worst wearing Goodyear is most likely a better quality tire than the worst wearing Sumitomo.
I agree on the mismatching of sizes. If you dont know anything about tires or sizes 100 percent i agree with you to keep the sizes the same. If you are knowledgeable about tire sizes then 10-1 you'll be able to make the best educated choice for the application you are using it for.
I understand that mismatched styles can effect the handling of a vehicle, but like i said before....if youre resorting to using a used tire then most likely your tires that are being replaced are pretty shot and will do you worst than a different tread pattern. Its not hard to spot match a tread pattern when choosing tires.
splitting hairs with all season/snow and performance tires is what i come to expect from you billy
its good info what you said...of course you dont want to mix up different designated tires. shouldve been more specific.