2002 Z3 came with a 125/90-16 space saver spare. You can still get that size tire at tirerack, it has the correct overall diameter (24.9") for the 318ti. Looks like you can still order the wheel from a BMW dealer.
Wheel p/n : 36116750006 __________________ ~Dave~
98 328ti Morea Grun slicktop
11 128i space gray slicktop
13 JGC WK2 Deep Cherry
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