255/65R17 vs 235/75R17
235/75R17 is 2.8% taller (+0.83 in) and 0.79 in narrower than 255/65R17.
235/75R17 is 2.8% taller than 255/65R17. That is inside the ±3% most shops treat as a straight swap.
Real speed on 235/75R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 235/75R17 tires
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255/65R17 or 235/75R17?
Can I use 235/75R17 instead of 255/65R17?
235/75R17 is 2.8% taller than 255/65R17. 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 235/75R17 you are really doing 61.7 mph if the speedometer was set up for 255/65R17. Going the other way, 255/65R17 would make it read 58.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.41 in (+11 mm) under the axle.