175/70R14 vs 185/70R14
185/70R14 is taller than 175/70R14 by 2.33% — a diameter difference of 0.55″.
What changes between 175/70R14 and 185/70R14
Switching from 175/70R14 to 185/70R14 changes overall diameter by +2.33%, a taller tire by 0.55 inches. This lands inside the ±3% fitment safe zone, so most vehicles will accept the swap without rubbing, speedometer recalibration, or ABS/TPMS complications. Section width moves by +0.39″ (175mm → 185mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.28″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -19, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 66.5 mph. Both sizes share the same 14″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 175/70R14 | 185/70R14 |
|---|---|---|
| Overall diameter | 23.65″ | 24.2″ |
| Section width | 6.89″ (175 mm) | 7.28″ (185 mm) |
| Sidewall height | 4.82″ (70%) | 5.1″ (70%) |
| Rim diameter | 14″ | 14″ |
| Circumference | 74.29″ | 76.02″ |
| Revs per mile | 853 | 834 |
Interactive comparison
275/65R18 or "33" for inch aliases175/70R14
- Diameter
- 23.65″ / 600.6mm
- Section Width
- 6.89″
- Sidewall
- 4.82″ / 122.5mm
- Circumference
- 74.29″
- Revs/Mile
- 853
185/70R14
- Diameter
- 24.2″ / 614.6mm
- Section Width
- 7.28″
- Sidewall
- 5.1″ / 129.5mm
- Circumference
- 76.02″
- Revs/Mile
- 834
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 61.4 mph (98.81 km/h). Your speedometer reads 2.33% low versus actual speed.