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2 x width x side wall / 2540 + rim size = Tire dia.
205/40/17
2 x 205 x 40 / 2540 + 17 = 23.45
91-94 SER tire 185/60/14
2 x 185 x 60 / 2540 + 14 = 22.74
91-93 NX2000 195/55/14
2 x 195 x 55 / 2540 + 14 = 22.44
95-98 200sx SER 195/55/15
2 x 195 x 55 / 2540 + 15 = 23.44
205/40/17
2 x 205 x 40 / 2540 + 17 = 23.45
91-94 SER tire 185/60/14
2 x 185 x 60 / 2540 + 14 = 22.74
91-93 NX2000 195/55/14
2 x 195 x 55 / 2540 + 14 = 22.44
95-98 200sx SER 195/55/15
2 x 195 x 55 / 2540 + 15 = 23.44