265/50R19 vs 245/65R17
245/65R17 is 0.4% taller (+0.11 in) and 0.79 in narrower than 265/50R19.
245/65R17 is 0.4% taller than 265/50R19. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/65R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/65R17 tires
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265/50R19 or 245/65R17?
Can I use 245/65R17 instead of 265/50R19?
245/65R17 is 0.4% taller than 265/50R19. 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 245/65R17 you are really doing 60.2 mph if the speedometer was set up for 265/50R19. Going the other way, 265/50R19 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.05 in (+1 mm) under the axle.