275/60R20 vs 275/65R20

275/65R20 is 1.1" taller than 275/60R20 (3.3%)

Diameter difference+3.28%diameter 32.99" → 34.07"
275/60R20275/65R20
275/60R20275/65R20Difference
Overall diameter32.99"34.07"+1.08"
Section width10.83"10.83"±0.00"
Sidewall height6.50"7.04"+0.54"
Circumference103.6"107.0"+3.4"
Revolutions per mile611592−19
Wheel diameter20"20"±0"

Speedometer

ShowsActualDiff
30 mph31.0 mph+1.0
45 mph46.5 mph+1.5
60 mph62.0 mph+2.0
70 mph72.3 mph+2.3
80 mph82.6 mph+2.6

Gear ratio to match

CurrentEquivalent
3.423.53
3.553.67
3.733.85
4.104.23

275/65R20 is 1.08" taller than 275/60R20, a +3.28% 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 0.54" (half the diameter change), and the tire needs 0.54" more room above it.

Both tires are the same width, 10.83".

Both fit a 20" wheel; the sidewall is 0.54" taller on 275/65R20.

Details: 275/60R20 in inches · 275/65R20 in inches · change sizes in the calculator

FAQ

What is the difference between 275/60R20 and 275/65R20?

275/65R20 is 1.08" taller (+3.28%) and 0.00" wider than 275/60R20.

Will 275/65R20 change my speedometer?

Yes, by +3.28%. When the speedometer shows 60 mph you would be going 62.0 mph.

Can I replace 275/60R20 with 275/65R20?

It is a +3.3% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.