275/65R18 vs 285/45R22
285/45R22 is 0.1% taller (+0.02 in) and 0.39 in wider than 275/65R18.
285/45R22 is 0.1% taller than 275/65R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 285/45R22.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 285/45R22 tires
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275/65R18 or 285/45R22?
Can I use 285/45R22 instead of 275/65R18?
285/45R22 is 0.1% taller than 275/65R18. 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 285/45R22 you are really doing 60.0 mph if the speedometer was set up for 275/65R18. Going the other way, 275/65R18 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.