225/35R20 vs 245/35R20
245/35R20 is 2.1% taller (+0.55 in) and 0.79 in wider than 225/35R20.
245/35R20 is 2.1% taller than 225/35R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/35R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/35R20 tires
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225/35R20 or 245/35R20?
Can I use 245/35R20 instead of 225/35R20?
245/35R20 is 2.1% taller than 225/35R20. 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 245/35R20 you are really doing 61.3 mph if the speedometer was set up for 225/35R20. Going the other way, 225/35R20 would make it read 58.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.28 in (+7 mm) under the axle.