275/40R17 vs 315/35R17

315/35R17 is 0.0" taller than 275/40R17 (0.1%)

Diameter difference+0.08%diameter 25.66" → 25.68"
275/40R17315/35R17
275/40R17315/35R17Difference
Overall diameter25.66"25.68"+0.02"
Section width10.83"12.40"+1.57"
Sidewall height4.33"4.34"+0.01"
Circumference80.6"80.7"+0.1"
Revolutions per mile786785−1
Wheel diameter17"17"±0"

Speedometer

ShowsActualDiff
30 mph30.0 mph+0.0
45 mph45.0 mph+0.0
60 mph60.0 mph+0.0
70 mph70.1 mph+0.1
80 mph80.1 mph+0.1

Gear ratio to match

CurrentEquivalent
3.423.42
3.553.55
3.733.73
4.104.10

315/35R17 is 0.02" taller than 275/40R17, a +0.08% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.01" (half the diameter change), and the tire needs 0.01" more room above it.

315/35R17 is 1.57" wider. On the same wheel offset about half of that, 0.79", moves toward the suspension and half toward the fender.

Both fit a 17" wheel; the sidewall is 0.01" taller on 315/35R17.

Details: 275/40R17 in inches · 315/35R17 in inches · change sizes in the calculator

FAQ

What is the difference between 275/40R17 and 315/35R17?

315/35R17 is 0.02" taller (+0.08%) and 1.57" wider than 275/40R17.

Will 315/35R17 change my speedometer?

Yes, by +0.08%. When the speedometer shows 60 mph you would be going 60.0 mph.

Can I replace 275/40R17 with 315/35R17?

Often yes: the diameter change of +0.1% is within the common 3% guideline. Check the load index, speed rating and clearance.