205/45R17 vs 205/50R17
205/50R17 is taller than 205/45R17 by 3.33% — a diameter difference of 0.81″.
What changes between 205/45R17 and 205/50R17
Switching from 205/45R17 to 205/50R17 changes overall diameter by +3.33%, a taller tire by 0.81 inches. This sits in the 3–5% caution band, where rubbing at full steering lock or suspension compression becomes possible. Leveling kits or fender-liner trims are often needed on lifted trucks. Section width moves by 0.00″ (205mm → 205mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.41″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -27, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 67.2 mph. Both sizes share the same 17″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 205/45R17 | 205/50R17 |
|---|---|---|
| Overall diameter | 24.26″ | 25.07″ |
| Section width | 8.07″ (205 mm) | 8.07″ (205 mm) |
| Sidewall height | 3.63″ (45%) | 4.04″ (50%) |
| Rim diameter | 17″ | 17″ |
| Circumference | 76.23″ | 78.76″ |
| Revs per mile | 831 | 804 |
Interactive comparison
275/65R18 or "33" for inch aliases205/45R17
- Diameter
- 24.26″ / 616.3mm
- Section Width
- 8.07″
- Sidewall
- 3.63″ / 92.25mm
- Circumference
- 76.23″
- Revs/Mile
- 831
205/50R17
- Diameter
- 25.07″ / 636.8mm
- Section Width
- 8.07″
- Sidewall
- 4.04″ / 102.5mm
- Circumference
- 78.76″
- Revs/Mile
- 804
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 62 mph (99.77 km/h). Your speedometer reads 3.33% low versus actual speed.