245/50R18 vs 275/40R19
275/40R19 is 0.1% taller (+0.02 in) and 1.18 in wider than 245/50R18.
275/40R19 is 0.1% taller than 245/50R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 275/40R19.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/40R19 tires
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245/50R18 or 275/40R19?
Can I use 275/40R19 instead of 245/50R18?
275/40R19 is 0.1% taller than 245/50R18. 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 275/40R19 you are really doing 60.0 mph if the speedometer was set up for 245/50R18. Going the other way, 245/50R18 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.