Tire size comparison
315/70R17 vs 35x11.50R17
35x11.50R17 is +1.9% taller than 315/70R17: 35.0 in vs 34.4 in (+0.64 in), and 0.9 in narrower. With 35x11.50R17 on a vehicle set up for 315/70R17, the speedometer shows 60 mph at an actual 61.1 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 (35x11.50R17 instead of 315/70R17) · 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
315/70R17 vs 35x11.50R17: full comparison
| 315/70R17 | 35x11.50R17 | Difference | |
|---|---|---|---|
| Overall diameter | 34.36 in | 35.00 in | +0.64 in (+1.9%) |
| Width | 12.40 in | 11.50 in | −0.90 in (−7.3%) |
| Sidewall height | 8.68 in | 9.00 in | +0.32 in |
| Circumference | 108.0 in | 110.0 in | +2.0 in |
| Revs per mile (nominal) | 587 | 576 | −11 |
| Wheel diameter | 17 in | 17 in | ±0 in |
| Diameter in mm | 873 | 889 | +16 mm |
Speedometer difference
Your speedometer is calibrated for 315/70R17. Fitted with 35x11.50R17, the actual speed is the reading × 35.00 ÷ 34.36.
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.4 mph | +0.4 mph |
| 30 mph | 30.6 mph | +0.6 mph |
| 45 mph | 45.8 mph | +0.8 mph |
| 55 mph | 56.0 mph | +1.0 mph |
| 60 mph | 61.1 mph | +1.1 mph |
| 70 mph | 71.3 mph | +1.3 mph |
| 80 mph | 81.5 mph | +1.5 mph |
Real tires: published diameters
315/70R17: 34.4–34.7 in published by 5 makers; 35x11.50R17: 34.5–35 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: 315/70R17 · 35x11.50R17
Related comparisons
FAQ
Which is bigger, 315/70R17 or 35x11.50R17?
35x11.50R17 is +1.9% taller than 315/70R17: 35.0 in vs 34.4 in (+0.64 in).
How much will my speedometer be off with 35x11.50R17 instead of 315/70R17?
The speedometer is calibrated for 315/70R17. With 35x11.50R17 it shows 60 mph when you are doing 61.1 mph, and 70 mph at 71.3 mph (+1.9%). Your speedometer also has its own factory tolerance.
Can I replace 315/70R17 with 35x11.50R17?
The diameter difference is +1.9%. 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.