Tire Size Comparison Compare tire sizes side-by-side in inches or millimeters. Current Tire Size: Tread Width: 125130145155165175185195205215225235245255265275285295305315325335345355365 Aspect Ratio: 20253035404550556065707580859095 Wheel Diameter: 1213141516171819202122232425262728 New Tire Size: Tread Width: 125130145155165175185195205215225235245255265275285295305315325335345355365 Aspect Ratio: 20253035404550556065707580859095 Wheel Diameter: 1213141516171819202122232425262728 Inches Millimeters