Where do I find the correct tire pressure for my boat trailer?

The correct tire pressure for your boat trailer is determined by the tire manufacturer. This number is printed on the tire sidewall as the recommended cold inflation PSI for that tire’s maximum load capacity.

You may also see a tire information placard or vehicle certification label permanently attached to your trailer. These labels generally match the tire manufacturer’s specifications and also provide:

• Recommended tire size
• Cold tire inflation pressure (PSI)
• Vehicle capacity weight (VCW)
• Gross axle weight ratings (GAWR)

Why Boat Trailers Are Different from Passenger Vehicles

For passenger cars and trucks, manufacturers sometimes recommend pressures lower than the tire sidewall maximum to balance safety with ride comfort. But trailers are different:

• Boat trailers usually run close to maximum load every time they’re towed.
• Trailers don’t need “ride comfort” adjustments the way cars do.
• Because of this, the sidewall PSI from the tire manufacturer is the correct value to use for safety and performance.

Cold Inflation Only

Always check and set tire pressure when the tires are “cold” (before towing or after sitting for at least three hours). Heat from driving naturally increases PSI — this is normal and already factored into the tire’s rating.

Double-Check Online

For added peace of mind, you can also verify inflation recommendations directly on the tire manufacturer’s website. Many brands publish official load and inflation charts for each tire model.

Safety Tip

Never reduce pressure below the manufacturer’s recommendation to “soften the ride.” Underinflated tires are the leading cause of trailer blowouts.