Tire size comparison
185/55R16 vs 195/50R16
195/50R16 is −1.4% shorter than 185/55R16: 23.7 in vs 24.0 in (−0.33 in), and 0.4 in wider. With 195/50R16 on a vehicle set up for 185/55R16, the speedometer shows 60 mph at an actual 59.2 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 (195/50R16 instead of 185/55R16) · 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
185/55R16 vs 195/50R16: full comparison
| 185/55R16 | 195/50R16 | Difference | |
|---|---|---|---|
| Overall diameter | 24.01 in | 23.68 in | −0.33 in (−1.4%) |
| Width | 7.28 in | 7.68 in | +0.39 in (+5.4%) |
| Sidewall height | 4.01 in | 3.84 in | −0.17 in |
| Circumference | 75.4 in | 74.4 in | −1.1 in |
| Revs per mile (nominal) | 840 | 852 | +12 |
| Wheel diameter | 16 in | 16 in | ±0 in |
| Diameter in mm | 610 | 601 | −8 mm |
Speedometer difference
Your speedometer is calibrated for 185/55R16. Fitted with 195/50R16, the actual speed is the reading × 23.68 ÷ 24.01.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 19.7 mph | −0.3 mph |
| 30 mph | 29.6 mph | −0.4 mph |
| 45 mph | 44.4 mph | −0.6 mph |
| 55 mph | 54.2 mph | −0.8 mph |
| 60 mph | 59.2 mph | −0.8 mph |
| 70 mph | 69.0 mph | −1.0 mph |
| 80 mph | 78.9 mph | −1.1 mph |
Real tires: published diameters
185/55R16: 23.9–24.2 in published by 4 makers; 195/50R16: 23.7 in published by 3 makers. Calculated figures assume a nominal tire; the exact difference between two specific tires depends on their models.
More about each size: 185/55R16 · 195/50R16
Related comparisons
FAQ
Which is bigger, 185/55R16 or 195/50R16?
195/50R16 is −1.4% shorter than 185/55R16: 23.7 in vs 24.0 in (−0.33 in).
How much will my speedometer be off with 195/50R16 instead of 185/55R16?
The speedometer is calibrated for 185/55R16. With 195/50R16 it shows 60 mph when you are doing 59.2 mph, and 70 mph at 69.0 mph (−1.4%). Your speedometer also has its own factory tolerance.
Can I replace 185/55R16 with 195/50R16?
The diameter difference is −1.4%. 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.