255/65R17 vs 245/70R17
245/70R17 is 1.5% taller (+0.45 in) and 0.39 in narrower than 255/65R17.
245/70R17 is 1.5% taller than 255/65R17. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/70R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/70R17 tires
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255/65R17 or 245/70R17?
Can I use 245/70R17 instead of 255/65R17?
245/70R17 is 1.5% 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 245/70R17 you are really doing 60.9 mph if the speedometer was set up for 255/65R17. Going the other way, 255/65R17 would make it read 59.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.23 in (+6 mm) under the axle.