a 305/30/19 or a 315/25/19
assuming both tires are the same make and model

would the extra sidewall on the 305 help out in tight cornering ?

 

^^ x 2 with that question for me....???

 

You'd think more tread width = more grip
and less sidewall = better response because there is less sidewall to flex

I suppose you could take a page from drifters who stretch skinny tires onto wide wheels to reduce sidewall flex but the amount of stretch difference between a 305 and 315 is minimal.

Example: http://i168.photobucket.com/albums/u...C2419_copy.jpg

 

alan my car is RWD

also, as far as the stretched thing.. i think toyo made a mistake on every single one of their tires, because when you compare a 315mm toyo, to a 315mm michelin, or a 315mm anything... the toyo is shorter

the steering response from these tires isn't bad...
... if you're comparing it to a boat