195/65R15 vs 225/40R18
225/40R18 is 0.4% taller (+0.11 in) and 1.18 in wider than 195/65R15.
225/40R18 is 0.4% taller than 195/65R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 225/40R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 225/40R18 tires
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195/65R15 or 225/40R18?
Can I use 225/40R18 instead of 195/65R15?
225/40R18 is 0.4% taller than 195/65R15. 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 225/40R18 you are really doing 60.3 mph if the speedometer was set up for 195/65R15. Going the other way, 195/65R15 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.05 in (+1 mm) under the axle.