275/55R20 vs 32x11.50R15
32x11.50R15 is 0.3% taller (+0.09 in) and 0.67 in wider than 275/55R20.
32x11.50R15 is 0.3% taller than 275/55R20. That is inside the ±3% most shops treat as a straight swap.
| 275/55R20 | 32x11.50R15 | Change | |
|---|---|---|---|
| Diameter | 31.91″ | 32.00″ | +0.09″+0.3% |
| Width | 10.83″ | 11.50″ | +0.67″+6.2% |
| Sidewall | 5.95″ | 8.50″ | +2.55″+42.7% |
| Circumference | 100.2″ | 100.5″ | +0.3″+0.3% |
| Wheel | 20″ | 15″ | −5″ |
| Revs per mile | 632 | 630 | −2 |
Real speed on 32x11.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 32x11.50R15 tires
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275/55R20 or 32x11.50R15?
Can I use 32x11.50R15 instead of 275/55R20?
32x11.50R15 is 0.3% taller than 275/55R20. That is inside the ±3% most shops treat as a straight swap. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 32x11.50R15 you are really doing 60.2 mph if the speedometer was set up for 275/55R20. Going the other way, 275/55R20 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.05 in (+1 mm) under the axle.