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

315/70R17
315 Tire width
70 Profile height
R17 Tire diameter
365 RPM per km
315mm221mm873mm2742mm
315
70
17
305
70
16
Parameters Sizes Old New
Diameter, mm873833-40 (-4.6%)
Width, mm315305-10 (-3.2%)
Circumference, mm27422618-124 (-4.5%)
Profile height, mm221214-7 (-3.2%)
RPM per km365382+17 (+4.7%)
Clearance change, mm-20
Result:
The diameter differs by -4.6%.
Speedometer reading (km/h)
Real speed (km/h)95.5
Difference (km/h)-4.5

Sizes for comparison of tires 315/70 R17

R17
R18 +1

Sizes for comparison of tires 305/70 R16

R16
R17 +1
R18 +2