245/45R19 vs 215/75R15
215/75R15 is 0.1% taller (+0.02 in) and 1.18 in narrower than 245/45R19.
215/75R15 is 0.1% taller than 245/45R19. 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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245/45R19 or 215/75R15?
Can I use 215/75R15 instead of 245/45R19?
215/75R15 is 0.1% taller than 245/45R19. 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 60.0 mph if the speedometer was set up for 245/45R19. Going the other way, 245/45R19 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.