215/35R18 vs 225/35R18
Going from one to the other changes the overall height by +1.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/35R18 | 225/35R18 | Change |
|---|---|---|---|
| Overall height | 23.9" | 24.2" | +1.2 % |
| Sidewall | 2.96" | 3.10" | +4.7 % |
| Section width | 215 mm | 225 mm | +4.7 % |
| Circumference | 75.2" | 76.0" | +1.2 % |
| Revs per mile | 843 | 833 | -1.2 % |
| Axle height | 11.96" | 12.10" | +3.5 mm |
| Approved rim width | 6–8" | 6–8.5" | overlap 6–8" |
Both are approved on a rim 6" to 8" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 215/35R18. Fit 225/35R18 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 |
| 50 mph | 50.6 mph | +0.6 |
| 70 mph | 70.8 mph | +0.8 |
| 90 mph | 91.0 mph | +1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,115 on the road, so it under-counts by 115. At a true 70 mph the first turns 983 times a minute, the second 972.
What drivers reported
215/35R18 carries 2 complaints. Nobody has filed one naming 225/35R18.