275/60R15 vs 235/75R15

235/75R15 is 0.9" taller than 275/60R15 (3.2%)

Diameter difference+3.16%diameter 27.99" → 28.88"
275/60R15235/75R15
275/60R15235/75R15Difference
Overall diameter27.99"28.88"+0.89"
Section width10.83"9.25"−1.57"
Sidewall height6.50"6.94"+0.44"
Circumference87.9"90.7"+2.8"
Revolutions per mile720698−22
Wheel diameter15"15"±0"

Speedometer

ShowsActualDiff
30 mph30.9 mph+0.9
45 mph46.4 mph+1.4
60 mph61.9 mph+1.9
70 mph72.2 mph+2.2
80 mph82.5 mph+2.5

Gear ratio to match

CurrentEquivalent
3.423.53
3.553.66
3.733.85
4.104.23

235/75R15 is 0.89" taller than 275/60R15, a +3.16% change in diameter. That is more than the 3% many tire shops use as a limit, so plan on recalibrating the speedometer and checking ABS and stability control.

Ground clearance changes by 0.44" (half the diameter change), and the tire needs 0.44" more room above it.

275/60R15 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 15" wheel; the sidewall is 0.44" taller on 235/75R15.

Details: 275/60R15 in inches · 235/75R15 in inches · change sizes in the calculator

FAQ

What is the difference between 275/60R15 and 235/75R15?

235/75R15 is 0.89" taller (+3.16%) and 1.57" narrower than 275/60R15.

Will 235/75R15 change my speedometer?

Yes, by +3.16%. When the speedometer shows 60 mph you would be going 61.9 mph.

Can I replace 275/60R15 with 235/75R15?

It is a +3.2% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.