16-inch rim · tyre size comparison
215/65 R16 vs 225/70 R16
225/70 R16 is 35.5 mm (1.4 in) taller than 215/65 R16, a +5.18% difference in overall diameter. That is outside the ±3% limit commonly used to screen a tire size change, so expect a noticeable speedometer error; it is a nominal calculation, not a fitment approval.
- Diameter difference
- +35.5 mm
- +1.4 in · +5.18%
- Indicated 70 mph
- 73.6 mph
- Actual speed on 225/70 R16, if the speedometer was accurate on 215/65 R16.
- Sidewall height
- +17.75 mm
- 139.75 mm to 157.5 mm.
Dimensions side by side
| Measurement | 215/65 R16 | 225/70 R16 | Difference |
|---|---|---|---|
| Overall diameter | 685.9 mm27 in | 721.4 mm28.4 in | +35.5 mm (+5.18%)+1.4 in |
| Section width | 215 mm8.46 in | 225 mm8.86 in | +10 mm+0.39 in |
| Sidewall height | 139.75 mm5.5 in | 157.5 mm6.2 in | +17.75 mm+0.7 in |
| Circumference | 2,154.82 mm84.84 in | 2,266.34 mm89.23 in | +111.53 mm+4.39 in |
| Rim diameter | 406.4 mm16 in | 406.4 mm16 in | 0 mm0 in |
| Revolutions per mile | 746.86 | 710.11 | -36.75 |
| Revolutions per km | 464.08 | 441.24 | -22.84 |
Calculated from the nominal size codes, without load or tread wear. Real tyres vary by model, rim width and pressure, so the exact tyre's published dimensions take priority.
Speedometer with 225/70 R16
If the speedometer was accurate on 215/65 R16, fitting 225/70 R16 means the car is travelling 5.18% faster than it shows, and the odometer under-records distance by about the same amount.
| Speedometer shows | Actual on 225/70 R16 | Difference |
|---|---|---|
| 30 mph | 31.55 mph | +1.55 mph |
| 50 mph | 52.59 mph | +2.59 mph |
| 60 mph | 63.11 mph | +3.11 mph |
| 70 mph | 73.62 mph | +3.62 mph |
| 50 km/h | 52.59 km/h | +2.59 km/h |
| 100 km/h | 105.18 km/h | +5.18 km/h |
UN ECE Regulation 39, used in the UK and EU, does not allow a speedometer to show less than the true speed, so many read slightly high from the factory. A taller tyre uses up some of that margin. Calibration varies by car; these figures are the tyre-size effect only.
What changes from 215/65 R16 to 225/70 R16
Wheels
Both fit 16-inch wheels. Our rim-width starting estimate is 6 to 7 inches for 215/65 R16 and 6 to 7 inches for 225/70 R16, so a 6 to 7-inch wheel sits in both ranges. The exact tyre's approved rim range takes priority.
Sidewall and ride comfort
225/70 R16 has 17.75 mm more sidewall (157.5 vs 139.75 mm). A taller sidewall usually rides noticeably softer and gives the rim more protection from potholes and kerbs, at the cost of some steering sharpness.
Contact width
225/70 R16 is 10 mm wider in nominal section width (4.7%). A wider tyre usually puts a wider, shorter contact patch on the road, which can help dry grip, but it may follow ruts more, clear standing water less readily and add some rolling resistance.
Wheel well clearance
Ride height changes by about +17.8 mm, and the top of the tyre moves the same distance closer to the arch. On the same wheel width and offset, each sidewall moves about 5 mm further out towards the arch lip and further in towards the suspension. Check clearance at full steering lock and full suspension compression, especially on a lowered car.
Gearing
The effective final drive changes by -4.92%: 3,000 rpm at a given road speed becomes about 2,850 rpm. Gearing gets noticeably longer, so cruising revs drop and acceleration in each gear softens.
ABS, stability control and AWD
These systems compare wheel speeds. Fit the same size on both ends of an axle; with a 5.2% diameter gap, never mix 215/65 R16 and 225/70 R16 on an AWD car, and follow the car maker's rolling-circumference limits, which can be much tighter than 3%.
General tendencies from the nominal numbers, not a test of any tyre. Load index, speed rating, tyre construction and the car's approved sizes matter more than these rules of thumb.
Explained in our guides
- Plus-sizing wheels: tyre diameter and speedometer changesWork through a 17 to 18 inch wheel change, compare tyre diameters and speedometer effects, and understand why a 3% rule cannot approve fitment.
- Staggered vs square wheels: tyres, rotation and AWDCompare square and staggered wheel setups, calculate front-to-rear tyre diameter, and understand rotation limits and all-wheel-drive requirements.
- How to read a tyre size, load index and sidewall markingsDecode tyre width, aspect ratio, rim diameter, load and speed markings, then calculate sidewall height and diameter using a 225/45 R17 example.
Cars in our guides using these sizes
Factory trims and popular community setups from our fitment guides. A popular setup is not a factory approval; each guide explains its trims, axles and clearance limits.
215/65 R16
- Volkswagen Transporter T5/T5.1 (2003–2015)Factory trim
225/70 R16
- Jeep Cherokee XJ (1984–2001)Factory trim
More comparisons
215/65 R16 compared
225/70 R16 compared
Questions
Can I use 225/70 R16 instead of 215/65 R16?
Both fit 16-inch wheels. The diameter difference is +5.18%, outside the ±3% screening limit, so most fitters would treat it as a different size class rather than a direct replacement. That does not approve fitment: check the car maker's approved sizes, load index, speed rating, rim width and clearance first.
How much bigger is 225/70 R16 than 215/65 R16?
Overall diameter is 35.5 mm (1.4 in) larger: 721.4 vs 685.9 mm. Section width is 10 mm wider, and the sidewall is 17.75 mm taller. These are nominal figures; real tyres vary by model and rim width.
Will 225/70 R16 change my speedometer reading?
Yes, by 5.18%. If the speedometer was accurate on 215/65 R16, an indicated 60 mph would be about 63.1 mph on 225/70 R16, and an indicated 100 km/h about 105.2 km/h. You would be going faster than the speedometer shows.
Which is better, 215/65 R16 or 225/70 R16?
Neither in general. 225/70 R16 has the taller sidewall, which usually rides more comfortably; 215/65 R16 usually steers more sharply. 225/70 R16 is wider, which can help dry grip; the narrower size is usually better in standing water and snow. The size listed for your car's trim, on its placard or in the handbook, is the safe default.
Check the exact tyre
Size codes give nominal dimensions. Before buying, confirm the size is approved for your car and check the exact tyre's load and speed ratings and published dimensions.