Tire size comparison
195/75R14 vs 195/70R14
195/70R14 is −3.0% shorter than 195/75R14: 24.7 in vs 25.5 in (−0.77 in), and the same width. With 195/70R14 on a vehicle set up for 195/75R14, the speedometer shows 60 mph at an actual 58.2 mph. That is more than the ±3% difference many shops use as a rule of thumb, so check carefully before switching.
Set up for: going smaller (195/70R14 instead of 195/75R14) · 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
195/75R14 vs 195/70R14: full comparison
| 195/75R14 | 195/70R14 | Difference | |
|---|---|---|---|
| Overall diameter | 25.52 in | 24.75 in | −0.77 in (−3.0%) |
| Width | 7.68 in | 7.68 in | ±0.00 in (±0.0%) |
| Sidewall height | 5.76 in | 5.37 in | −0.38 in |
| Circumference | 80.2 in | 77.7 in | −2.4 in |
| Revs per mile (nominal) | 790 | 815 | +25 |
| Wheel diameter | 14 in | 14 in | ±0 in |
| Diameter in mm | 648 | 629 | −19 mm |
Speedometer difference
Your speedometer is calibrated for 195/75R14. Fitted with 195/70R14, the actual speed is the reading × 24.75 ÷ 25.52.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 19.4 mph | −0.6 mph |
| 30 mph | 29.1 mph | −0.9 mph |
| 45 mph | 43.6 mph | −1.4 mph |
| 55 mph | 53.3 mph | −1.7 mph |
| 60 mph | 58.2 mph | −1.8 mph |
| 70 mph | 67.9 mph | −2.1 mph |
| 80 mph | 77.6 mph | −2.4 mph |
Real tires: published diameters
195/75R14: 25.4–25.5 in published by 3 makers; 195/70R14: 24.7–24.9 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: 195/75R14 · 195/70R14
Related comparisons
FAQ
Which is bigger, 195/75R14 or 195/70R14?
195/70R14 is −3.0% shorter than 195/75R14: 24.7 in vs 25.5 in (−0.77 in).
How much will my speedometer be off with 195/70R14 instead of 195/75R14?
The speedometer is calibrated for 195/75R14. With 195/70R14 it shows 60 mph when you are doing 58.2 mph, and 70 mph at 67.9 mph (−3.0%). Your speedometer also has its own factory tolerance.
Can I replace 195/75R14 with 195/70R14?
The diameter difference is −3.0%. 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.