User Manual for Horizon Hobby 140mm Inflatable Tundra Tire and Beadlock Wheel Set

Quick Guide from the Manual

This document provides instructions for the assembly, inflation, and maintenance of the 140mm Inflatable Tundra Tire and Beadlock Wheel Set. Key safety warnings include not using this product for children under 14 years of age and ensuring the tire pressure does not exceed 3 psi to prevent damage. Always read the full manual before operation.

Specifications

• Aircraft Weight: Up to 10–12 pounds (4.5–5.4 kg) ready to fly.
• Diameter: 5.5” (140mm) recommended; range 5.0” (127mm) to 5.75” (146mm).
• Axle Compatibility: 5mm wheel hub (native); includes adapters for 3mm and 4mm axles.
• Max Pressure: 3 psi.
• Included Tools: 1.5mm hex driver, small flat-head screwdriver.

Tire Pressure and Inflation

Inflation directly affects the tire diameter. Inflating the tires increases the diameter, while reducing pressure decreases it. For most applications, inflate to 5.5” (140mm). Use lower pressure for rough surfaces and higher pressure for smooth surfaces.

To inflate or deflate:

1. Attach the included air hose extension to your air pump.
2. Screw the needle into the end of the air hose.
3. Wet the needle before inserting it into the air valve in the wheel hub.
4. Do not exceed 3 psi or 5.75” (146mm) diameter.
5. To deflate, insert the needle into the air valve without the pump attached; air will release immediately.

Installation

1. Remove existing wheels/tires from the airplane axles.
2. Select the appropriate axle adapter (3mm or 4mm) if required. The hub fits 5mm axles without an adapter.
3. Slide the wheel onto the axle.
4. Secure the wheel using your existing wheel collars.
5. Optional Hubcaps: If using hubcaps, ensure the axle does not extend past the outer wheel hub. Spacers or axle modification may be required. Press and snap the hubcap onto the outer wheel hub.

Replacing or Repairing the Tire

In the event of damage, tires can be replaced or repaired using an inner tube repair kit.

1. Insert a small flat-head screwdriver into the hubcap slot and carefully pop the hubcap off.
2. Remove the wheel collar from the axle.
3. Use a 1.5mm hex driver to remove the beadlock wheel hubs.
4. Replace the tire or inflation valve as needed.
5. Tighten each beadlock screw in small increments, alternating evenly across all screws.

Replacement Parts

The following parts are available for maintenance:

• EFL-1333: Replacement Inflatable Tundra Tire Set, 5.5” (140mm)
• EFL-1349: Air Pump and Air Needle
• EFL-1385: Tundra Beadlock Hubcaps, Locking Screws, Axle Adapters, Rubber Valve Plug
• EFL-1393: Tundra Inflatable Replacement Rubber Tire

Warranty and Service

Horizon Hobby provides a limited warranty against defects in materials and workmanship. For service, you must contact your local distributor or Horizon Hobby directly. Proof of purchase is required for all warranty claims. Do not ship LiPo batteries to Horizon Hobby.