235/45R19 vs 255/45R19
255/45R19 is 2.6% taller (+0.71 in) and 0.79 in wider than 235/45R19.
255/45R19 is 2.6% taller than 235/45R19. That is inside the ±3% most shops treat as a straight swap.
Real speed on 255/45R19.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 255/45R19 tires
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235/45R19 or 255/45R19?
Can I use 255/45R19 instead of 235/45R19?
255/45R19 is 2.6% taller than 235/45R19. 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 255/45R19 you are really doing 61.6 mph if the speedometer was set up for 235/45R19. Going the other way, 235/45R19 would make it read 58.5 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.35 in (+9 mm) under the axle.