285/75R16 vs 305/75R16 is the 16-inch truck plus-width. Same rim, same 75-series math, 20 mm more section. Height goes from 32.8″ to 34.0″. Compare them live: 285/75R16 vs 305/75R16.
The two stamps
| Size | Diameter | Width | Sidewall |
|---|---|---|---|
| 285/75R16 | 32.8″ | 11.2″ | 8.4″ |
| 305/75R16 | 34.0″ | 12.0″ | 9.0″ |
Diameter grows +3.6%. Width grows +7.0%. At 60 indicated on a truck calibrated for the 285, the 305 is doing 62.2 mph actual. That is past the usual 3% first filter. Recalibrate if you can.
Why 16-inch trucks search this
285/75R16 is a common Tacoma, Tundra and older F-150 16-inch stamp. 305/75R16 is the next width that still mounts on a 16. The Tacoma tire size page is the stock list. This page is only the geometry.
16-inch wells are not 20-inch wells
A 305 on a 16 is a lot of sidewall. Rubbing at full lock or on a stock bump stop is a year-and-lift question. We will not invent a Tacoma clearance chart.