Tire Diameters for Common Porsche Fittments
Copyright 2000 Dr. Steve Timmins
InstantG, Inc.
Tire Diameter Stats					Ref Dia
				Dia	24.75	Kumho E	Kumho V	Hoozier	gForce
185	75	14		24.93	0.7%
195	70	15		25.75	4.0%
205	65	14		24.49	-1.0%
205	50	15		23.07	-6.8%	X	X		X
205	60	15		24.69	-0.3%			X	X
215	60	15		25.16	1.6%			X
225	45	15		22.97	-7.2%			X
225	50	15		23.86	-3.6%		X		X
225	55	15		24.74	0.0%			X
245	50	15		24.65	-0.4%			X	X
205	55	16		24.88	0.5%	X		X	X
225	50	16		24.86	0.4%	X	X	X
245	45	16		24.68	-0.3%	X	X	X	X
255	50	16		26.04	5.2%			X	X
265	45	16		25.39	2.6%		X
205	40	17		23.46	-5.2%	X		X
205	45	17		24.26	-2.0%	X
205	50	17		25.07	1.3%	X			X
215	40	17		23.77	-4.0%	X
215	45	17		24.62	-0.5%	X
225	40	17		24.09	-2.7%
225	45	17		24.97	0.9%	X	X	X	X
235	40	17		24.40	-1.4%	X			X
235	45	17		25.33	2.3%	X
245	40	17		24.72	-0.1%	X		X	X
245	45	17		25.68	3.8%	X	X	X	X
255	40	17		25.03	1.1%	X	X		X
255	45	17		26.04	5.2%	X		X
265	40	17		25.35	2.4%	X
275	40	17		25.66	3.7%	X	X	X	X
315	35	17		25.68	3.8%		X	X	X
335	35	17		26.23	6.0%			X	X
225	40	18		25.09	1.4%	X
245	35	18		24.75	0.0%			X
245	40	18		25.72	3.9%	X		X	X
255	35	18		25.03	1.1%	X
265	35	18		25.30	2.2%	X			X
275	35	18		25.58	3.3%	X		X
285	35	18		25.85	4.5%
285	30	18		24.73	-0.1%			X	X
295	35	18		26.13	5.6%				X
305	30	18		25.20	1.8%			X
315	30	18		25.44	2.8%			X
335	30	18		25.91	4.7%			X
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