Tire size
175/65 R15
Full dimensions and a live comparison calculator for the 175/65 R15 tire size.
Overall diameter
608.5 mm
23.96″
Sidewall height
113.8 mm
Circumference
1.912 m
Revs / km
523.1
Section width
175 mm
Aspect ratio
65%
Rim diameter
15″
381.0 mm
Radius
304.3 mm
What does 175/65 R15 mean?
The 175 is the section width in millimetres, measured sidewall to sidewall. The 65 is the aspect ratio — sidewall height as a percentage of width, so the sidewall here is 113.8 mm. The R15 means a radial-construction tire designed for a 15-inch wheel rim. Together these give an overall diameter of 609 mm.
Compare 175/65 R15 with another size
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+25.8 mm
4.24%
Speedometer at 100
104.2 km/h
+4.24% error
Ground clearance
+12.9 mm
ride height delta
Sidewall change
-12.5 mm
revs/km: 501.8
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/compare/175-65-r15-vs-225-45-r17Common alternatives to 175/65 R15
These sizes are within a few percent overall diameter — usually safe on the same vehicle from a speedometer-error standpoint.
Compare 175/65 R15 with popular upgrades
Plus-size upgrades from 175/65 R15
Fitment safety note
Overall diameter, speedometer error and circumference are only part of the picture. Physical clearance, wheel offset (ET), hub bore, suspension geometry, load index and your manufacturer's recommendation all decide whether a size is truly safe on your car. Always cross-check with the vehicle manual or a qualified fitter before changing tire size.