225/75R15 vs 30x9.50R15
30x9.50R15 is 6.1% taller (+1.71 in) and 0.64 in wider than 225/75R15.
30x9.50R15 is 6.1% taller than 225/75R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 225/75R15 | 30x9.50R15 | Change | |
|---|---|---|---|
| Diameter | 28.29″ | 30.00″ | +1.71″+6.1% |
| Width | 8.86″ | 9.50″ | +0.64″+7.2% |
| Sidewall | 6.64″ | 7.50″ | +0.86″+12.9% |
| Circumference | 88.9″ | 94.2″ | +5.4″+6.1% |
| Wheel | 15″ | 15″ | Same |
| Revs per mile | 713 | 672 | −41 |
Real speed on 30x9.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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225/75R15 or 30x9.50R15?
Can I use 30x9.50R15 instead of 225/75R15?
30x9.50R15 is 6.1% taller than 225/75R15. 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 30x9.50R15 you are really doing 63.6 mph if the speedometer was set up for 225/75R15. Going the other way, 225/75R15 would make it read 56.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.86 in (+22 mm) under the axle.