225/70R15 vs 215/75R15
215/75R15 is 1.1% taller (+0.30 in) and 0.39 in narrower than 225/70R15.
215/75R15 is 1.1% taller than 225/70R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 215/75R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 215/75R15 tires
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225/70R15 or 215/75R15?
Can I use 215/75R15 instead of 225/70R15?
215/75R15 is 1.1% taller than 225/70R15. 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 215/75R15 you are really doing 60.6 mph if the speedometer was set up for 225/70R15. Going the other way, 225/70R15 would make it read 59.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.15 in (+4 mm) under the axle.