Can Trailer Tires Be Under-Inflated to Reduce Trailer Bounce
Question:
Have a small boat trailer with 20.5 x 8 x 10 tires, Maximum weight of boat, motor and weight is estimated at less than 1000 lbs. Can I inflate to 30 to 35 psi or should I inflate to max on tire side wall of 70 psi. Trailer seems to bounce all over the road when inflated to maxs psi recommended.
asked by: Tony D
Expert Reply:
Trailer tires should always be inflated to their maximum air pressure. If the max psi listed on your trailer's side wall is 70 psi, then you will want to be sure to inflate the tires to 70 psi. I cannot recommend that you under-inflate your tires to 35 psi.
If the tire is not inflated to the max psi, the amount of weight the tire can safely carry will be reduced. Tires are designed to carry a particular amount of weight at a particular psi rating. If the tires are under-inflated and too heavy of a load is placed on the tires, the sidewall of the tire could heat up and cause tire failure.
The best solution I can recommend for you is to replace your existing tires with the same size tire but with a lower psi rating. The equivalent tire size to your existing 20.5x8x10 size tires is 205/65-10. The lowest rated 205/65-10 size tire we offer is the Loadstar K399, 205/65-10 Bias Trailer Tire, Load Range B # AM1HP50. This tire has a maximum load rating of 910 pounds at 35 psi. This is a much lower psi rating than your existing tires, but will still offer you enough capacity to safely carry your boat trailer.
You can see all of our 205/65-10 size tire on the linked page. I have also attached a help article on trailer tires for you.

Products Referenced in This Question
Loadstar K399 Bias Trailer Tire - 205/65-10 - Load Range B
- Trailer Tires and Wheels
- Tire Only
- Bias Ply Tire
- Load Range B
- 205/65-10
- 10 Inch
- M - 81 mph
- Kenda
more information >
Product Page this Question was Asked From
Loadstar K399 Bias Trailer Tire - 205/65-10 - Load Range C
- Trailer Tires and Wheels
- Tire Only
- Bias Ply Tire
- Load Range C
- 205/65-10
- 10 Inch
- M - 81 mph
- Kenda
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Karrier ST205/75R14 Radial Trailer Tire with 14" Galvanized Wheel - 5 on 4-1/2 - Load Range C
- Shop: Provider ST205/75R15 Trailer Tire with Black Vesper Mod Wheel - 5 on 4-1/2 - LR D
- Shop: Kenda Karrier ST205/75R14 Radial Trailer Tire with 14" Black Mod Wheel - 5 on 4-1/2 - LR C
- Shop: Karrier ST205/75R14 Radial Trailer Tire - Load Range C
- Shop: Westlake ST205/75R14 Radial Trailer Tire - Load Range D
- Shop: Karrier ST205/75R15 Radial Trailer Tire - Load Range D
- Shop: Kenda Karrier ST205/75R15 Trailer Tire with Black Mod Wheel - 5 on 4-1/2
- Q&A: How to Torque Suspension and Equalizer Bolts when Changing Shackles on a Horse Trailer
- Shop: RV Bearing
- Video: Curved Equalizer for 1-3/4" Wide Double-Eye Springs Review
- Video: Breaking Down the Hellwig EZ-990 Helper Springs
- Video: Trailer Wheel Measurements
- Search Results: valve
- Search Results: valve stems
- Search Results: st 205 75 14
- Search Results: dexter leaf spring
- Search Results: trailer axle
- Search Results: trailer tires
- Search Results: leaf spring suspension
- Article: 5 Tell-Tale Signs It’s Time to Replace Your Trailer’s Leaf Springs
- Q&A: Does the Axle Need to Be Supported When Replacing U-Bolts on a Trailer Axle
- Q&A: Torque Recommendation for 3/8 Inch Diameter Trailer Suspension U-Bolts
- Video: A Closer Look at the Powerbuilt Dual Drive Torque Wrench
- Shop: Trailer Hitch
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Article: How to Accurately Measure Trailer Leaf Springs
- Video: Measuring To Choose The Right Trailer Axle
- Video: 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles Spec Review
- Article: Most Popular Wheel Bearings
- Q&A: Can I Use Heavier Rated Leaf Springs on Trailer Without Causing Damage