Comparison of tire sizes 265/55 R19 and 255/65 R18
265/55R19
265
Tire width 
55
Profile height 
R19
Tire diameter 
411
RPM per km 265mm146mm774mm2432mm
265
55
19
255
65
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 774 | 789 | +15 (+1.9%) | ||
| Width, mm | 265 | 255 | -10 (-3.8%) | ||
| Circumference, mm | 2432 | 2478 | +46 (+1.9%) | ||
| Profile height, mm | 146 | 166 | +20 (+13.7%) | ||
| RPM per km | 411 | 404 | -7 (-1.7%) | ||
| Clearance change, mm | +8 | ||||
| Result: | The diameter differs by 1.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 101.9 |
| Difference (km/h) | 1.9 |
Sizes for comparison of tires 265/55 R19
R19
R18 -1
R20 +1
R17 -2
R21 +2
Sizes for comparison of tires 255/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2