235/70R17 vs 30x9.50R15
30x9.50R15 is 0.2% taller (+0.05 in) and 0.25 in wider than 235/70R17.
30x9.50R15 is 0.2% taller than 235/70R17. That is inside the ±3% most shops treat as a straight swap.
| 235/70R17 | 30x9.50R15 | Change | |
|---|---|---|---|
| Diameter | 29.95″ | 30.00″ | +0.05″+0.2% |
| Width | 9.25″ | 9.50″ | +0.25″+2.7% |
| Sidewall | 6.48″ | 7.50″ | +1.02″+15.8% |
| Circumference | 94.1″ | 94.2″ | +0.1″+0.2% |
| Wheel | 17″ | 15″ | −2″ |
| Revs per mile | 673 | 672 | −1 |
Real speed on 30x9.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 30x9.50R15 tires
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235/70R17 or 30x9.50R15?
Can I use 30x9.50R15 instead of 235/70R17?
30x9.50R15 is 0.2% taller than 235/70R17. 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 30x9.50R15 you are really doing 60.1 mph if the speedometer was set up for 235/70R17. Going the other way, 235/70R17 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.02 in (+1 mm) under the axle.