225/40R19 vs 255/40R19
255/40R19 is 3.6% taller (+0.94 in) and 1.18 in wider than 225/40R19.
255/40R19 is 3.6% taller than 225/40R19. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 255/40R19.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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225/40R19 or 255/40R19?
Can I use 255/40R19 instead of 225/40R19?
255/40R19 is 3.6% taller than 225/40R19. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 255/40R19 you are really doing 62.2 mph if the speedometer was set up for 225/40R19. Going the other way, 225/40R19 would make it read 57.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.47 in (+12 mm) under the axle.