Tire size comparison
215/70R15 vs 235/60R15
235/60R15 is −2.8% shorter than 215/70R15: 26.1 in vs 26.9 in (−0.75 in), and 0.8 in wider. With 235/60R15 on a vehicle set up for 215/70R15, the speedometer shows 60 mph at an actual 58.3 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 (235/60R15 instead of 215/70R15) · 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
215/70R15 vs 235/60R15: full comparison
| 215/70R15 | 235/60R15 | Difference | |
|---|---|---|---|
| Overall diameter | 26.85 in | 26.10 in | −0.75 in (−2.8%) |
| Width | 8.46 in | 9.25 in | +0.79 in (+9.3%) |
| Sidewall height | 5.93 in | 5.55 in | −0.37 in |
| Circumference | 84.4 in | 82.0 in | −2.4 in |
| Revs per mile (nominal) | 751 | 773 | +22 |
| Wheel diameter | 15 in | 15 in | ±0 in |
| Diameter in mm | 682 | 663 | −19 mm |
Speedometer difference
Your speedometer is calibrated for 215/70R15. Fitted with 235/60R15, the actual speed is the reading × 26.10 ÷ 26.85.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 19.4 mph | −0.6 mph |
| 30 mph | 29.2 mph | −0.8 mph |
| 45 mph | 43.7 mph | −1.3 mph |
| 55 mph | 53.5 mph | −1.5 mph |
| 60 mph | 58.3 mph | −1.7 mph |
| 70 mph | 68.0 mph | −2.0 mph |
| 80 mph | 77.8 mph | −2.2 mph |
Real tires: published diameters
215/70R15: 26.8–27.1 in published by 3 makers; 235/60R15: 26 in published by 1 maker. Calculated figures assume a nominal tire; the exact difference between two specific tires depends on their models.
More about each size: 215/70R15 · 235/60R15
FAQ
Which is bigger, 215/70R15 or 235/60R15?
235/60R15 is −2.8% shorter than 215/70R15: 26.1 in vs 26.9 in (−0.75 in).
How much will my speedometer be off with 235/60R15 instead of 215/70R15?
The speedometer is calibrated for 215/70R15. With 235/60R15 it shows 60 mph when you are doing 58.3 mph, and 70 mph at 68.0 mph (−2.8%). Your speedometer also has its own factory tolerance.
Can I replace 215/70R15 with 235/60R15?
The diameter difference is −2.8%. 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.