205/75R14 vs 225/35R20
225/35R20 is 0.4% taller (+0.09 in) and 0.79 in wider than 205/75R14.
225/35R20 is 0.4% taller than 205/75R14. That is inside the ±3% most shops treat as a straight swap.
Real speed on 225/35R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 225/35R20 tires
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205/75R14 or 225/35R20?
Can I use 225/35R20 instead of 205/75R14?
225/35R20 is 0.4% taller than 205/75R14. 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 225/35R20 you are really doing 60.2 mph if the speedometer was set up for 205/75R14. Going the other way, 205/75R14 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.05 in (+1 mm) under the axle.