30x9.50R15 vs 32x11.50R15
32x11.50R15 is 6.7% taller (+2.00 in) and 2.00 in wider than 30x9.50R15.
32x11.50R15 is 6.7% taller than 30x9.50R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 30x9.50R15 | 32x11.50R15 | Change | |
|---|---|---|---|
| Diameter | 30.00″ | 32.00″ | +2.00″+6.7% |
| Width | 9.50″ | 11.50″ | +2.00″+21.1% |
| Sidewall | 7.50″ | 8.50″ | +1.00″+13.3% |
| Circumference | 94.2″ | 100.5″ | +6.3″+6.7% |
| Wheel | 15″ | 15″ | Same |
| Revs per mile | 672 | 630 | −42 |
Real speed on 32x11.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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30x9.50R15 or 32x11.50R15?
Can I use 32x11.50R15 instead of 30x9.50R15?
32x11.50R15 is 6.7% taller than 30x9.50R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. 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 64.0 mph if the speedometer was set up for 30x9.50R15. Going the other way, 30x9.50R15 would make it read 56.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.00 in (+25 mm) under the axle.