It to do with the less stiff sidewall's .I had re070 on the Jdm sti .Then went for toyo t1rs .I am running 34psi in the front and 30psi in the back and that seems to of helped alot.I was running 33psi and 29psi when the 235/45/17 re070 were on the car what subaru says in owner manual and thats the size of the toyo's