14-inch vs 15-inch rims · tyre size comparison
185/75 R14 vs 195/65 R15
195/65 R15 is 1.4 mm (0.06 in) taller than 185/75 R14, a +0.22% difference in overall diameter. That is well inside the ±3% limit commonly used to screen a tire size change; it is a nominal calculation, not a fitment approval.
- Diameter difference
- +1.4 mm
- +0.06 in · +0.22%
- Indicated 70 mph
- 70.2 mph
- Actual speed on 195/65 R15, if the speedometer was accurate on 185/75 R14.
- Sidewall height
- -12 mm
- 138.75 mm to 126.75 mm.
Dimensions side by side
| Measurement | 185/75 R14 | 195/65 R15 | Difference |
|---|---|---|---|
| Overall diameter | 633.1 mm24.93 in | 634.5 mm24.98 in | +1.4 mm (+0.22%)+0.06 in |
| Section width | 185 mm7.28 in | 195 mm7.68 in | +10 mm+0.39 in |
| Sidewall height | 138.75 mm5.46 in | 126.75 mm4.99 in | -12 mm-0.47 in |
| Circumference | 1,988.94 mm78.3 in | 1,993.34 mm78.48 in | +4.4 mm+0.17 in |
| Rim diameter | 355.6 mm14 in | 381 mm15 in | +25.4 mm+1 in |
| Revolutions per mile | 809.15 | 807.36 | -1.79 |
| Revolutions per km | 502.78 | 501.67 | -1.11 |
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 195/65 R15
If the speedometer was accurate on 185/75 R14, fitting 195/65 R15 means the car is travelling 0.22% faster than it shows, and the odometer under-records distance by about the same amount.
| Speedometer shows | Actual on 195/65 R15 | Difference |
|---|---|---|
| 30 mph | 30.07 mph | +0.07 mph |
| 50 mph | 50.11 mph | +0.11 mph |
| 60 mph | 60.13 mph | +0.13 mph |
| 70 mph | 70.15 mph | +0.15 mph |
| 50 km/h | 50.11 km/h | +0.11 km/h |
| 100 km/h | 100.22 km/h | +0.22 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 185/75 R14 to 195/65 R15
Wheels
These sizes need different wheels: 14-inch for 185/75 R14 and 15-inch for 195/65 R15. The larger wheel usually weighs a little more; the smaller one must still clear the brake calipers. Check rim width, offset and load rating for whichever wheel you fit.
Sidewall and ride comfort
195/65 R15 has 12 mm less sidewall (126.75 vs 138.75 mm). A shorter sidewall usually sharpens steering response, but rides a little firmer and leaves the rim more exposed to potholes and kerbs.
Contact width
195/65 R15 is 10 mm wider in nominal section width (5.4%). 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 +0.7 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
Effective gearing changes by -0.22%, too little to notice from the driver's seat.
ABS, stability control and AWD
These systems compare wheel speeds. Fit the same size on both ends of an axle, 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.
185/75 R14
195/65 R15
- Honda Civic / Civic Si / Civic Type R 8th gen (FA/FD/FG/FK/FN) (2006–2011)Factory trim
- Honda Civic / Civic Si 9th gen (FB/FG, North America) (2012–2015)Factory trim
- Honda Integra / Acura RSX DC5 (2001–2006)Factory trim
- Mazda Mazda3 / Mazda3 MPS / Mazdaspeed3 BK (2003–2009)Factory trim
- Mazda Mazda3 / Mazda3 MPS / Mazdaspeed3 BL (2009–2013)Factory trim
- Nissan Laurel C35 (1997–2002)Factory trim
- Nissan Silvia S15 (1999–2002)Factory trim
- Toyota Auris E180, 2nd gen (2012–2018)Factory trim
- Toyota Chaser JZX100 (1996–2001)Factory trim
- Toyota Chaser JZX90 (1992–1996)Factory trim
- Toyota Corolla E140 (North America) (2009–2013)Factory trim
- Toyota Corolla E210, North American non-GR (2018–present)Factory trim
- Toyota Mark II JZX110 (2000–2004)Factory trim
- Volkswagen Golf / GTI / R Mk6 (2008–2013)Factory trim
- Volkswagen Golf Mk4 (1997–2004)Factory trim
- Volkswagen Jetta / GLI Mk6 (A6) (2011–2018)Factory trim
More comparisons
195/65 R15 compared
Questions
Can I use 195/65 R15 instead of 185/75 R14?
Only on 15-inch wheels, not the 14-inch wheels that take 185/75 R14. The diameter difference is +0.22%, well inside the ±3% screening limit. 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 195/65 R15 than 185/75 R14?
Overall diameter is 1.4 mm (0.06 in) larger: 634.5 vs 633.1 mm. Section width is 10 mm wider, and the sidewall is 12 mm shorter. These are nominal figures; real tyres vary by model and rim width.
Will 195/65 R15 change my speedometer reading?
Yes, by 0.22%. If the speedometer was accurate on 185/75 R14, an indicated 60 mph would be about 60.1 mph on 195/65 R15, and an indicated 100 km/h about 100.2 km/h. You would be going faster than the speedometer shows.
Which is better, 185/75 R14 or 195/65 R15?
Neither in general. 185/75 R14 has the taller sidewall, which usually rides more comfortably; 195/65 R15 usually steers more sharply. 195/65 R15 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.