245/75R17 vs 265/75R16
265/75R16 is 0.6% taller (+0.18 in) and 0.79 in wider than 245/75R17.
265/75R16 is 0.6% taller than 245/75R17. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/75R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/75R16 tires
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245/75R17 or 265/75R16?
Can I use 265/75R16 instead of 245/75R17?
265/75R16 is 0.6% taller than 245/75R17. 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 265/75R16 you are really doing 60.3 mph if the speedometer was set up for 245/75R17. Going the other way, 245/75R17 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.09 in (+2 mm) under the axle.