Tire size
205/70 R15
Full dimensions and a live comparison calculator for the 205/70 R15 tire size.
Overall diameter
668.0 mm
26.30″
Sidewall height
143.5 mm
Circumference
2.099 m
Revs / km
476.5
Section width
205 mm
Aspect ratio
70%
Rim diameter
15″
381.0 mm
Radius
334.0 mm
What does 205/70 R15 mean?
The 205 is the section width in millimetres, measured sidewall to sidewall. The 70 is the aspect ratio — sidewall height as a percentage of width, so the sidewall here is 143.5 mm. The R15 means a radial-construction tire designed for a 15-inch wheel rim. Together these give an overall diameter of 668 mm.
Compare 205/70 R15 with another size
Current Tire
New Tire
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-33.7 mm
-5.04%
Speedometer at 100
95.0 km/h
-5.04% error
Ground clearance
-16.9 mm
ride height delta
Sidewall change
-42.3 mm
revs/km: 501.8
Permalink for this comparison:
/compare/205-70-r15-vs-225-45-r17Common alternatives to 205/70 R15
These sizes are within a few percent overall diameter — usually safe on the same vehicle from a speedometer-error standpoint.
Compare 205/70 R15 with popular upgrades
Plus-size upgrades from 205/70 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.