Tire size comparison
195/65R15 vs 205/55R16
205/55R16 is −0.4% shorter than 195/65R15: 24.9 in vs 25.0 in (−0.10 in), and 0.4 in wider. With 205/55R16 on a vehicle set up for 195/65R15, the speedometer shows 60 mph at an actual 59.8 mph. That is within the ±3% difference many shops use as a rule of thumb (not a manufacturer or legal limit).
Set up for: checking a replacement size (205/55R16 instead of 195/65R15) · Different situation?
Your current size
e.g. 265/70R17, 2657017 or 33x12.50R20
Where do I find my size?
It's on the tire sidewall, e.g. P265/70R17 115T, and on the tire placard sticker on the driver's door jamb (also in the owner's manual). The placard shows the size the vehicle came with; the sidewall shows what is fitted now. If they differ, use the placard as your starting point. Digits are enough here: 2657017 or 33125020.
Size you're considering
195/65R15 vs 205/55R16: full comparison
| 195/65R15 | 205/55R16 | Difference | |
|---|---|---|---|
| Overall diameter | 24.98 in | 24.88 in | −0.10 in (−0.4%) |
| Width | 7.68 in | 8.07 in | +0.39 in (+5.1%) |
| Sidewall height | 4.99 in | 4.44 in | −0.55 in |
| Circumference | 78.5 in | 78.2 in | −0.3 in |
| Revs per mile (nominal) | 807 | 811 | +3 |
| Wheel diameter | 15 in | 16 in | +1 in |
| Diameter in mm | 634 | 632 | −3 mm |
Speedometer difference
Your speedometer is calibrated for 195/65R15. Fitted with 205/55R16, the actual speed is the reading × 24.88 ÷ 24.98.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 19.9 mph | −0.1 mph |
| 30 mph | 29.9 mph | −0.1 mph |
| 45 mph | 44.8 mph | −0.2 mph |
| 55 mph | 54.8 mph | −0.2 mph |
| 60 mph | 59.8 mph | −0.2 mph |
| 70 mph | 69.7 mph | −0.3 mph |
| 80 mph | 79.7 mph | −0.3 mph |
Real tires: published diameters
195/65R15: 24.7–25.3 in published by 4 makers; 205/55R16: 24.7–25.2 in published by 5 makers. Calculated figures assume a nominal tire; the exact difference between two specific tires depends on their models.
More about each size: 195/65R15 · 205/55R16
Related comparisons
FAQ
Which is bigger, 195/65R15 or 205/55R16?
205/55R16 is −0.4% shorter than 195/65R15: 24.9 in vs 25.0 in (−0.10 in).
How much will my speedometer be off with 205/55R16 instead of 195/65R15?
The speedometer is calibrated for 195/65R15. With 205/55R16 it shows 60 mph when you are doing 59.8 mph, and 70 mph at 69.7 mph (−0.4%). Your speedometer also has its own factory tolerance.
Can I replace 195/65R15 with 205/55R16?
The diameter difference is −0.4%. Whether it fits depends on things this calculation can't see: wheel width and offset, clearance at full lock and over bumps, load index and speed rating, and your vehicle maker's approval. Check your door-jamb placard and owner's manual and ask a tire professional.