Tire size comparison
265/35R22 vs 265/40R22
265/40R22 is +3.6% taller than 265/35R22: 30.3 in vs 29.3 in (+1.04 in), and the same width. With 265/40R22 on a vehicle set up for 265/35R22, the speedometer shows 60 mph at an actual 62.1 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 bigger (265/40R22 instead of 265/35R22) · 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
265/35R22 vs 265/40R22: full comparison
| 265/35R22 | 265/40R22 | Difference | |
|---|---|---|---|
| Overall diameter | 29.30 in | 30.35 in | +1.04 in (+3.6%) |
| Width | 10.43 in | 10.43 in | ±0.00 in (±0.0%) |
| Sidewall height | 3.65 in | 4.17 in | +0.52 in |
| Circumference | 92.1 in | 95.3 in | +3.3 in |
| Revs per mile (nominal) | 688 | 665 | −24 |
| Wheel diameter | 22 in | 22 in | ±0 in |
| Diameter in mm | 744 | 771 | +26 mm |
Speedometer difference
Your speedometer is calibrated for 265/35R22. Fitted with 265/40R22, the actual speed is the reading × 30.35 ÷ 29.30.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.7 mph | +0.7 mph |
| 30 mph | 31.1 mph | +1.1 mph |
| 45 mph | 46.6 mph | +1.6 mph |
| 55 mph | 57.0 mph | +2.0 mph |
| 60 mph | 62.1 mph | +2.1 mph |
| 70 mph | 72.5 mph | +2.5 mph |
| 80 mph | 82.8 mph | +2.8 mph |
Real tires: published diameters
265/35R22: 29.1–29.4 in published by 5 makers; 265/40R22: 30.1–30.4 in published by 4 makers. Calculated figures assume a nominal tire; the exact difference between two specific tires depends on their models.
More about each size: 265/35R22 · 265/40R22
FAQ
Which is bigger, 265/35R22 or 265/40R22?
265/40R22 is +3.6% taller than 265/35R22: 30.3 in vs 29.3 in (+1.04 in).
How much will my speedometer be off with 265/40R22 instead of 265/35R22?
The speedometer is calibrated for 265/35R22. With 265/40R22 it shows 60 mph when you are doing 62.1 mph, and 70 mph at 72.5 mph (+3.6%). Your speedometer also has its own factory tolerance.
Can I replace 265/35R22 with 265/40R22?
The diameter difference is +3.6%. 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.