285/35R22 vs 275/40R22
275/40R22 is 2.7% taller (+0.81 in) and 0.39 in narrower than 285/35R22.
275/40R22 is 2.7% taller than 285/35R22. That is inside the ±3% most shops treat as a straight swap.
Real speed on 275/40R22.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/40R22 tires
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285/35R22 or 275/40R22?
Can I use 275/40R22 instead of 285/35R22?
275/40R22 is 2.7% taller than 285/35R22. 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 275/40R22 you are really doing 61.6 mph if the speedometer was set up for 285/35R22. Going the other way, 285/35R22 would make it read 58.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.40 in (+10 mm) under the axle.