Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires

Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires (7,000 lb Total Capacity) — Rockwell American

Get your trailer rolling smoothly and reliably with this complete 7,000 lb tandem axle running gear set from Rockwell American (a Dexter company), including wheels and tires for immediate use. Designed for precise fitment and smooth tracking on utility, cargo, landscape, and light-duty equipment trailers.

Includes two axles with hubs, double-eye leaf springs, U-bolt kits, hanger kit, and ST205/75D15 load range C bias ply tires on wheels. Features high-tensile strength tube, powder-coated finish, and Posi-Lube spindles for easy maintenance. Free Shipping in the Lower 48 states.

Rockwell American trailer axles are made in the USA with a 2-year manufacturer’s warranty, ensuring consistent tolerances and structural integrity for reliable performance.

What’s Included in This Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires:

• (2) 3,500 lb Electric Brake Axles with Hubs: Pre-assembled with 5 on 4.5 bolt pattern hubs, bearings, seals, races, grease caps, lug nuts, and 10″ electric brakes for easy bolt-on installation and reliable stopping power.
• (4) Double-Eye Leaf Springs: 1.75″ wide, rated at 1,750 lbs each (7,000 lbs total), 4-leaf design, 25.25″ eye to eye, 3″ arch, 9/16″ eye, made from high-strength steel for smooth ride and load support.
• (2) Round U-Bolt Kits: 2.375″ x 5.5″ x 1/2″-20 with U-bolts, plates, washers, and nuts for secure spring mounting and vibration resistance on both axles.
• (1) Tandem Hanger Kit for Double Eye Springs: 3500 lb+ capacity, includes hangers to mount the springs securely to your trailer frame, ensuring proper alignment and stability for both axles.
• (4) Wheels & Tires: Radial ST205/75R15, Radial tires for better handling, longevity, and load support, pre-mounted on 5-lug wheels for plug-and-play setup.

*Verify hub face, spring center and hub pattern in the options above. Selections may vary to match your trailer’s specs for a custom fit.

Choose Your Axle Size (HF/SC Measurements)

Select the exact hub-face (HF) and spring-center (SC) measurements to match your trailer’s frame width, hanger spacing, and tire/fender clearance. Ensuring safe, stable towing and preventing issues like rubbing or misalignment.

Hub-Face (HF): Measured from the outer face of one hub to the outer face of the other (across the full axle length). Common hub-face sizes range from 61″ to 95″ for standard trailers.

Spring-Center (SC): Measured from the center of one spring seat to the center of the other. This aligns with your trailer’s spring hanger brackets. Typically your spring center is 2″ less then your frame width.

Not sure which hub-face / spring-center (HF/SC) you need? Contact us—we’ll verify your measurements before you order. See our How to Measure a Trailer Axle guide or call (602) 292-9690.

Key Features and Specifications

• Brand: Rockwell American (a Dexter company)—trusted quality with American-made durability.
• Axle type: Tandem configuration with electric brakes on both axles for great stopping power and safety on highways.
• Capacity: 7,000 lb total GAWR (3,500 lb per axle) for reliable performance on utility, cargo, and landscape trailers.
• Posi-Lube® Spindles: Enable quick, clean bearing service with grease zerk for reduced maintenance time and continuous protection, ensuring long-term reliability on the road.
• Powder-Coated Axle Tube: Provides superior corrosion resistance against weather and road salt, extending the life of your 3500 lb idler axle in tough conditions.
• 5 on 4.5 (5×4.5) bolt pattern: Fits most 5-lug 13″–15″ trailer tire & wheel assemblies; confirm your bolt pattern before ordering.
• Cambered axle tube: (2-3/8” OD) with underslung, pre-welded spring pads for stable tracking and a lower deck height.
• Radial ST205/75R15 5 Lug Wheels & Tires: Radial tires for better handling, longevity, and load support, pre-mounted on 5-lug wheels for plug-and-play setup.
• Technical Components:
  • Spindle Size: #84 with grease zerk for standard 3,500 lb applications.
  • Brake Drums: #94545 – 10″ x 2-1/4″ Drum For 3,500lb Axles
  • Backing Plates: #4701-L (left) and 4701-R (right). Brake assembly, Electric, 10″x.25″ (3.5k cap per pair)
  • Inner Bearing: L68149 (1.378″ ID)
  • Outer Bearing: L44649 (1.063″ ID)
  • Inner Race: L68111 (2.361″ OD)
  • Outer Race: L44610 (1.98″ OD)
  • Grease Seal: Part #10-19 (1.719″ x 2.565″)
  • Wheel Stud Size: 1/2″-20

*Verify hub face, spring center and hub pattern in the options above. Selections may vary to match your trailer’s specs for a custom fit.

Documents & How-To Resources

Access these helpful guides and videos to install and maintain your Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires with confidence. Our resources cover everything from axle servicing to suspension setup for optimal trailer performance.

• • Operation & Service Manual — Rockwell American Trailer Axles (PDF): Step-by-step instructions for maintenance, lubrication, and troubleshooting your Rockwell American axle.
  • Trailer Suspension Diagram & Hanger Kit Spacing (Image): Visual reference for single and tandem axle hanger spacing with double-eye springs—perfect for ensuring proper alignment during installation.
  • Johnson Trailer Parts — YouTube How-To Videos: Watch our tutorial videos on trailer assembly, axle replacement, and tips for using running gear kits like this one.

Frequently Asked Questions (FAQs)

Got questions about the Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires? We’ve got answers to help you choose and install with confidence.

Installation Video

Watch this quick video tutorial on installing a similar trailer axle running gear set. Get tips on measurements, assembly, and common pitfalls to avoid for a smooth setup.

Questions? We’re Here to Help with Your Trailer Axle Setup

Have questions about the Tandem 3,500 lb Axle Running Gear Set with Wheels & Tires? Our experts can confirm your HF/SC measurements, bolt pattern compatibility, and even source custom sizes if needed. Get personalized advice to ensure a perfect fit for your trailer—reach out today for fast, friendly support.

Call (602) 292-9690, email sales@johnsontrailerparts.com, or use our Contact page.