You can order the whole kit online shipped for half that. Don't pay $500 for it
OK there are the tire sizes. Now does anyone know why the spare isn't available with the 20" wheels?
I doubt we will know but your numbers make me think I may go ahead and get one later this year.
From what I've heard its not good to run different sized wheels on any limited slip differential. Over a VERY short stretch and at low speeds I think you would be okay. Just don't run around like that for days at a time or more miles than necessary to get the tire replaced.
Yep I think the differentials are a little tougher that what people are led to believe by the manufacturers. Also think of it this way, every time you turn a corner one of the wheels is turning at a different speed than the other side both front and rear. Granted those are for usually short periods of time but it adds up. Running a spare for a few miles at low speeds isn't going to grenade a differential in my estimation.
that spare in the link will clear the PP Ecoboost brakes (14" 4-piston fronts) since they are cribbed off the GTs. The OP has an ecoboost if Im not mistaken. fwiw I got a fullsize rim and non-directional all-season as a spare, just in case for trips or bad weather.
The spare is 18" if I am not mistaken. The rear differential must have even height on each side or else the difference will wear out the limited slip. If your car came standard from the factory with 19" PP wheels, the 18" donut will eventually chew out the diff if you get a rear flat. One can always take the time to put one of the fronts on a blown rear and use a donut on the front, but that brings us to problem #2, GT cars with the PP have 15" rotors that will most definitely not fit under the donut. It has nothing to do with cost or fuel economy.
