225/60R18 vs 245/45R20
245/45R20 is 0.2% taller (+0.05 in) and 0.79 in wider than 225/60R18.
245/45R20 is 0.2% taller than 225/60R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/45R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/45R20 tires
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225/60R18 or 245/45R20?
Can I use 245/45R20 instead of 225/60R18?
245/45R20 is 0.2% taller than 225/60R18. 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 245/45R20 you are really doing 60.1 mph if the speedometer was set up for 225/60R18. Going the other way, 225/60R18 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.03 in (+1 mm) under the axle.