215/75R15 vs 225/75R15
225/75R15 is 2.1% taller (+0.59 in) and 0.39 in wider than 215/75R15.
225/75R15 is 2.1% taller than 215/75R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 225/75R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 225/75R15 tires
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215/75R15 or 225/75R15?
Can I use 225/75R15 instead of 215/75R15?
225/75R15 is 2.1% taller than 215/75R15. 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 225/75R15 you are really doing 61.3 mph if the speedometer was set up for 215/75R15. Going the other way, 215/75R15 would make it read 58.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.30 in (+8 mm) under the axle.