The best trailer axle kit with tires is one that matches your trailer’s axle capacity, hub-face measurement, spring-center measurement, and wheel bolt pattern. For heavy tandem trailers, the 7,000-pound kits offer electric brakes and mounted tires; for lighter single-axle trailers, the 3,500-pound idler kits include suspension hardware and tires. The options below cover several common configurations, but measurements must match your trailer before ordering.
| Kit | Best For | Key Fitment |
|---|---|---|
| Rockwell American 7,000 lb Tandem, 95 in | Heavy tandem trailers | 95 in hub face; 80 in spring center |
| Rockwell American 3,500 lb Idler, 73 in | Light single-axle trailers | 73 in hub face; 58 in spring center |
| Rockwell American 7,000 lb Tandem, 89 in | Narrower heavy tandem frames | 89 in hub face; 74 in spring center |
| Salo 5,200 lb Single Axle | Mid-capacity single-axle trailers | 85 in hub face; 70 in spring center |
| Salo 5,200 lb Tandem | Mid-capacity tandem trailers | 95 in hub face; 80 in spring center |
Rockwell American 7,000 lb Tandem Kit, 95-Inch Hub Face
Best for: Heavy utility, cargo, boat, landscape, and dump trailers with an 82-inch-wide frame and tandem axles. The kit includes two 7,000-pound electric-brake axles, double-eye springs, U-bolt kits, tandem hangers, equalizers, shackles, and ST235/80R16 radial tires on 8-lug wheels.
Its 95-inch hub face, 80-inch spring center, and 8-on-6.5-inch bolt pattern are important fitment specifications. The 12-by-2-inch electric brakes and Posi-Lube spindles are useful features for buyers seeking braking equipment and accessible bearing lubrication in the same package.
Limitation: This is a large-capacity setup, so avoid choosing it based only on tire size. Confirm the trailer’s frame measurements and required capacity first.
Rockwell American 3,500 lb Idler Kit, 73-Inch Hub Face
Best for: Light-duty single-axle trailers rated for 3,500 pounds, including utility, cargo, boat, and landscape trailers. The package includes one idler axle, two double-eye leaf springs, a U-bolt kit, a single-axle hanger kit, and ST205/75R15 radial tires mounted on 5-lug wheels.
This option is specified for a 60-inch-wide trailer frame, with a 73-inch hub face, 58-inch spring center, and 5-on-4.5-inch bolt pattern. Choose it if those measurements match and electric brakes are not required.
Limitation: It is an idler axle kit, not an electric-brake axle kit. Its listed 3,500-pound capacity makes it unsuitable for a trailer requiring a higher-rated axle.
Rockwell American 7,000 lb Tandem Kit, 89-Inch Hub Face
Best for: Heavy tandem trailers with a 76-inch-wide frame that need electric brakes and a narrower fit than the 95-inch version. It includes two 7,000-pound electric-brake axles, suspension and tandem hanger hardware, and ST235/80R16 radial tires on 8-lug wheels.
The listed dimensions are an 89-inch hub face and 74-inch spring center, with an 8-on-6.5-inch bolt pattern. It also features 12-by-2-inch electric brakes and Posi-Lube spindles. It is a better fit than the 95-inch model only when these measurements suit the trailer.
Limitation: The kit’s listed fitment is specific; do not assume it fits every 76-inch frame without checking hub-face and spring-center dimensions.
Salo 5,200 lb Single Axle Kit With Tires
Best for: Buyers replacing a single axle on a mid-capacity trailer who want electric brakes and a complete running-gear package. It includes one 5,200-pound electric-brake axle, double-eye springs, U-bolts, a hanger kit with shackles and hardware, and ST225/75R15 radial tires on 6-lug wheels.
Check the 85-inch hub face, 70-inch spring center, 3-inch axle tube, and 6-on-5.5-inch bolt pattern against the trailer. The Posi-Lube system provides bearing lubrication through a built-in grease zerk without hub removal.
Limitation: This is a single-axle package. Its stated fitment is for most 72-inch-wide frames, not a substitute for measuring the actual trailer.
Salo 5,200 lb Tandem Kit With Tires
Best for: Tandem trailers requiring two 5,200-pound axles and a stated total axle capacity of 10,400 pounds. The package includes electric-brake axles, leaf springs, U-bolts, hangers, and ST225/75R15 radial tires mounted on 6-lug wheels.
Its 95-inch hub face, 80-inch spring center, 3-inch axle tube, and 6-on-5.5-inch bolt pattern are specified for most 82-inch-wide trailer frames. Posi-Lube fittings allow bearing lubrication without removing the hubs. Choose this over a 7,000-pound tandem kit when the 5,200-pound axle rating and listed fitment match your needs.
Limitation: The listed total capacity is 10,400 pounds; confirm that the trailer’s required capacity and other components are appropriate for the intended load.
Buying Guide: How To Choose A Trailer Axle Kit With Tires
Which measurements should you check?
Compare the kit’s hub face and spring center with the trailer’s existing axle and suspension layout. Hub face is measured across the hub mounting surfaces; spring center is measured between the centers of the springs. Also check the stated frame width and axle-tube diameter. Small measurement differences can prevent a kit from fitting as intended.
Should you choose a single or tandem kit?
Choose a single-axle kit for a trailer designed around one axle and a tandem kit for a trailer configured for two. The products above vary in axle count and capacity, so do not treat the combined capacity of a tandem kit as the trailer’s payload rating. The trailer, tires, wheels, and other components also affect safe load limits.
Do you need electric brakes or an idler axle?
Electric-brake kits include braking hardware on the axle; idler kits do not. Select based on the trailer’s existing setup and applicable requirements. The 3,500-pound Rockwell American kits listed here are idler models, while the 5,200- and 7,000-pound options include electric brakes.
What should you match on the tires and wheels?
Verify tire size, wheel bolt pattern, and lug count against the trailer and its requirements. These kits include different tire sizes and patterns, such as 5-on-4.5, 6-on-5.5, and 8-on-6.5 inches. A tire or wheel that looks similar may not have the right fitment.
Frequently Asked Questions
Do these kits include tires and wheels?
Yes. Each kit described above lists tires mounted on wheels, along with axle and suspension components. Tire sizes and wheel bolt patterns vary by model.
Can I use a 7,000-pound axle on any tandem trailer?
No. The axle rating alone does not confirm fit. Match the hub face, spring center, frame width, bolt pattern, and trailer’s overall requirements.
What is the difference between an idler axle and an electric-brake axle?
An idler axle does not include the electric brakes specified on the brake-axle kits. Choose the type that matches the trailer’s design and braking needs.
How do I know which bolt pattern I need?
Check the existing wheel or hub pattern and compare its lug count and spacing with the kit listing. The featured kits use several different patterns, so confirm before ordering.
Does tandem axle capacity equal payload capacity?
No. A kit’s stated axle capacity is not automatically the trailer’s payload rating. Consider the ratings of the trailer and all relevant components when determining allowable load.