Automobile owners get more luggage space when they use this space saving tire, and forgetful air inflators need never find themselves without a spare because this one is carried flat and needs only a little pressure boost to make it wheelworthy. Moreover, the capability of operating when deflated is a bonus characteristic. This is the thin tread emergency spare tire by Goodrich. Deflated, it is only slightly larger than its rim. Expanded, it is normal size and shape. The mechanics of expansion are explained here and operational data and test results are presented.
