just curious.....what (specs) specifically are you wanting to alter?....and why for instance... I try to get around neg 3 degrees (manual steer) of caster for higher speed stability ....anymore tilt and it takes the fun out of super slow speed turning (power neg 6 degrees max) 0 camber....I want the tires straight up and down....not an everyday driver and do not car to compensate for road crown toe in 1/32 toe in ....minimal as possible and still have toe-in these days, the techs do not even know the specs....the computer program tells them what to do realistically, I would use the same specs for bias ply or radial....why the diff?. not arguing....I am wanting to understand the reasoning