285/45R22 vs 285/55R20
285/55R20 is 0.8% taller (+0.24 in) and the same width than 285/45R22.
285/55R20 is 0.8% taller than 285/45R22. That is inside the ±3% most shops treat as a straight swap.
Real speed on 285/55R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 285/55R20 tires
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285/45R22 or 285/55R20?
Can I use 285/55R20 instead of 285/45R22?
285/55R20 is 0.8% taller than 285/45R22. 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 285/55R20 you are really doing 60.5 mph if the speedometer was set up for 285/45R22. Going the other way, 285/45R22 would make it read 59.5 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.12 in (+3 mm) under the axle.