285/35R21 vs 275/45R21
275/45R21 is 6.5% taller (+1.89 in) and 0.39 in narrower than 285/35R21.
275/45R21 is 6.5% taller than 285/35R21. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 275/45R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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285/35R21 or 275/45R21?
Can I use 275/45R21 instead of 285/35R21?
275/45R21 is 6.5% taller than 285/35R21. 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 275/45R21 you are really doing 63.9 mph if the speedometer was set up for 285/35R21. Going the other way, 285/35R21 would make it read 56.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.94 in (+24 mm) under the axle.