Spare Tire Size Calculator

Original Tire Diameter (inches): Original Tire Width (mm): New Tire Width (mm):

Vehicle Tire Size (Inches)	Recommended Spare Tire Size (Inches)
31	30
33	32
35	34
37	36
265/75R16	265/70R16
285/70R17	285/65R17
305/60R18	305/55R18
33×12.5R20	32×11.5R20
35×12.5R22	34×11.5R22