205/70R15 vs 225/75R15
225/75R15 is 7.6% taller (+1.99 in) and 0.79 in wider than 205/70R15.
225/75R15 is 7.6% taller than 205/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 225/75R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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205/70R15 or 225/75R15?
Can I use 225/75R15 instead of 205/70R15?
225/75R15 is 7.6% taller than 205/70R15. 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 225/75R15 you are really doing 64.5 mph if the speedometer was set up for 205/70R15. Going the other way, 205/70R15 would make it read 55.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.99 in (+25 mm) under the axle.