SidewallerTire & wheel calculators

305/70R16 vs 285/75R16

285/75R16 is 0.1% taller (+0.02 in) and 0.79 in narrower than 305/70R16.

OK
Close match

285/75R16 is 0.1% taller than 305/70R16. That is inside the ±3% most shops treat as a straight swap.

305/70R16285/75R16Change
Diameter32.81″32.83″+0.02″+0.1%
Width12.01″11.22″−0.79″−6.6%
Sidewall8.41″8.42″+0.01″+0.1%
Circumference103.1″103.1″+0.1″+0.1%
Wheel16″16″Same
Revs per mile615614−0
SideTread
305/70R16285/75R16
Speedometer shows 60 mph60.0mph

Real speed on 285/75R16.

Ground clearance+0.01in

Change in height under the axle.

Width per side−0.39in

On the same wheel, split inboard and outboard.

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305/70R16 or 285/75R16?

Can I use 285/75R16 instead of 305/70R16?

285/75R16 is 0.1% taller than 305/70R16. 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 285/75R16 you are really doing 60.0 mph if the speedometer was set up for 305/70R16. Going the other way, 305/70R16 would make it read 60.0 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.01 in (+0 mm) under the axle.

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