235/65R17 vs 245/70R17
245/70R17 is 5.1% taller (+1.48 in) and 0.39 in wider than 235/65R17.
245/70R17 is 5.1% taller than 235/65R17. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 245/70R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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235/65R17 or 245/70R17?
Can I use 245/70R17 instead of 235/65R17?
245/70R17 is 5.1% taller than 235/65R17. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. 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 63.1 mph if the speedometer was set up for 235/65R17. Going the other way, 235/65R17 would make it read 57.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.74 in (+19 mm) under the axle.