Comparison of tire sizes 305/70 R16 and 315/70 R17

305/70R16
305 Tire width
70 Profile height
R16 Tire diameter
382 RPM per km
305mm214mm833mm2618mm
305
70
16
315
70
17
Parameters Sizes Old New
Diameter, mm833873+40 (+4.8%)
Width, mm305315+10 (+3.3%)
Circumference, mm26182742+124 (+4.7%)
Profile height, mm214221+7 (+3.3%)
RPM per km382365-17 (-4.5%)
Clearance change, mm+20
Result:
The diameter differs by 4.8%.
Speedometer reading (km/h)
Real speed (km/h)104.7
Difference (km/h)4.7

Sizes for comparison of tires 305/70 R16

R16
R17 +1
R18 +2

Sizes for comparison of tires 315/70 R17

R17
R18 +1