225/70R16 vs 255/65R16
255/65R16 is 2.3% taller (+0.65 in) and 1.18 in wider than 225/70R16.
255/65R16 is 2.3% taller than 225/70R16. That is inside the ±3% most shops treat as a straight swap.
Real speed on 255/65R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 255/65R16 tires
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225/70R16 or 255/65R16?
Can I use 255/65R16 instead of 225/70R16?
255/65R16 is 2.3% taller than 225/70R16. 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 255/65R16 you are really doing 61.4 mph if the speedometer was set up for 225/70R16. Going the other way, 225/70R16 would make it read 58.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.32 in (+8 mm) under the axle.