245/45R18 vs 245/40R19
245/40R19 is 0.1% taller (+0.04 in) and the same width than 245/45R18.
245/40R19 is 0.1% taller than 245/45R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/40R19.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/40R19 tires
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245/45R18 or 245/40R19?
Can I use 245/40R19 instead of 245/45R18?
245/40R19 is 0.1% taller than 245/45R18. 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 245/40R19 you are really doing 60.1 mph if the speedometer was set up for 245/45R18. Going the other way, 245/45R18 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.02 in (+0 mm) under the axle.