ST235/85R16 Trailer Tires

ST235/85R16 is the taller of the two common 16-inch trailer sizes, used on heavier fifth wheels, equipment and dump trailers, and horse trailers. It is also written as 235/85R16 or 235/85-16 and measures about 31.7 inches tall and 9.3 inches wide. The 85 series sidewall is about an inch taller than a 235/80R16 and carries more weight.

We carry it in load range E (10-ply, about 3,640 lbs per tire) and load range G (14-ply, about 3,900 lbs per tire), all radial, including the Goodyear Endurance. Match the load range on your current tire or the trailer's capacity sticker, and never go lower. Orders ship from the U.S. with tracking.

Common questions

When do I need load range G?
When the loaded trailer weight divided by the tire count is above about 3,500 lbs, or when the trailer's placard calls for it. Load range G runs around 110 psi, so the wheel must be rated for that pressure.

Can I go from 235/85R16 to 235/80R16?
Only if the 80 series meets your load requirement, which it usually does not on a trailer specified for 85s. Keep the size the placard calls for.

What wheel does it need?
A 16x6 wheel in 6 on 5.5 or 8 on 6.5, rated for the tire's pressure. See our 16-inch trailer wheels.