Run flats are bad : heavy ,
Run flats are bad : heavy , expensive , hard ride . Adding a full size spare that can be changed fast & doesn't use storage space . Great idea ! With a little fairing aero is better . Offsetting extra weight . Front to back balance is improved .I would love to find one for my Miata . Car doesn't have a jack ($99) extra . My GTRdoesn't have a jack ( $ 300) added full size tire& wheel in trunk. Less worried about a flat!