225/60R14 vs 205/70R14
Going from one to the other changes the overall height by +2.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/60R14 | 205/70R14 | Change |
|---|---|---|---|
| Overall height | 24.6" | 25.3" | +2.7 % |
| Sidewall | 5.31" | 5.65" | +6.3 % |
| Section width | 225 mm | 205 mm | -8.9 % |
| Circumference | 77.4" | 79.5" | +2.7 % |
| Revs per mile | 819 | 797 | -2.7 % |
| Axle height | 12.31" | 12.65" | +8.5 mm |
| Approved rim width | 6–8.5" | 5.5–7.5" | overlap 6–7.5" |
Both are approved on a rim 6" to 7.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 225/60R14. Fit 205/70R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.4 mph | +1.4 |
| 70 mph | 71.9 mph | +1.9 |
| 90 mph | 92.4 mph | +2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,272 on the road, so it under-counts by 272. At a true 70 mph the first turns 955 times a minute, the second 930.
What drivers reported
Nobody has filed a complaint naming 225/60R14. 205/70R14 carries 20.