Carlisle 320440 TR6 Tire Tube – Fits AT21x11-8, AT22x11-8 & AT22x12-8 ATV Tires

Part Number: 320440
Category: Tires & Wheels → Tire Tubes → ATV & UTV Tire Tubes
Type: Carlisle 320440 TR6 Tire Tube – Fits AT21x11-8, AT22x11-8 & AT22x12-8 ATV Tires

The Carlisle 320440 TR6 Tire Tube is a genuine heavy-duty replacement inner tube designed for AT21x11-8, AT22x11-8, and AT22x12-8 ATV tires. Constructed from durable natural rubber and equipped with a TR6 straight rubber valve stem, this tube provides dependable air retention and reliable performance for all-terrain vehicles (ATVs), utility vehicles, recreational off-road machines, and other equipment using compatible 8-inch wheels. Carlisle identifies Part #320440 as an AT21/22x11/12R8 radial ATV tube with a TR6 valve stem.

Key Features & Benefits

• Part Number: 320440
• Genuine Carlisle replacement tire tube
• Fits AT21x11-8, AT22x11-8, and AT22x12-8 tires
• Heavy-duty natural rubber construction
• TR6 straight rubber valve stem
• Excellent air retention and durability
• Designed for ATV and off-road applications
• Direct replacement for damaged or leaking tubes
• Manufactured to original equipment specifications

Technical Specifications

Part Number: 320440

Brand: Carlisle

Product Type: ATV Tire Tube

Tube Size: AT21/22x11/12R8

Valve Stem: TR6 Straight Rubber Valve

Valve Offset: 25 mm

Material: Natural Rubber

Rim Diameter: 8 in.

Application: ATV & Off-Road Tires

Compatible Tire Sizes

The Carlisle 320440 TR6 Tire Tube is designed for:

• AT21x11-8
• AT22x11-8
• AT22x12-8

It is also compatible with several additional ATV tire sizes, including:

• AT20x10-8
• AT20x11-8
• AT21x10-8
• AT21x12-8
• AT22x9-8
• AT22x10-8
• AT22x11R8
• AT22x11R9
• AT20x7-8
• AT20x7R9
• AT21x8R9
• AT22x7R9
• AT23x8R9

Always verify your tire size and valve stem type before ordering.

Compatible Applications

Ideal for use on:

• All-terrain vehicles (ATVs)
• Utility ATVs
• Sport ATVs
• Recreational off-road vehicles
• Utility vehicles using compatible 8-inch ATV tires

Function of the Tire Tube

The Carlisle 320440 TR6 Tire Tube fits inside compatible ATV tires to create and maintain an airtight seal. It helps to:

• Maintain proper tire inflation
• Replace punctured or leaking inner tubes
• Extend tire service life
• Improve ride quality and traction
• Restore dependable off-road performance

Its heavy-duty rubber construction is designed to withstand demanding off-road conditions while providing reliable air retention.

Common Signs Replacement Is Needed

Replace the tire tube if you notice:

• Frequent loss of air pressure
• Punctures or tears beyond repair
• Cracked or dry-rotted rubber
• Damaged or leaking valve stem
• Pinched or twisted tube
• Excessive wear or deterioration

Replacing a damaged tube helps restore reliable tire performance and reduce unexpected downtime.

Installation & Service Notes

Completely deflate the tire before removing it from the wheel.

Inspect the inside of the tire and wheel for nails, thorns, sharp edges, or debris before installing the new Carlisle 320440 TR6 Tire Tube. Lightly inflate the tube prior to installation to help prevent pinching, carefully position the TR6 valve stem through the valve hole, and mount the tire according to the equipment manufacturer's recommendations. Inflate the tire to the recommended operating pressure and check for leaks before returning the vehicle to service.

Important: Always verify your tire size, rim diameter, and valve stem style before ordering. Avoid pinching the tube during installation and follow the ATV manufacturer's recommended tire inflation pressure.

Maintenance Recommendations

• Check tire pressure before every ride.
• Inspect the valve stem regularly for leaks or damage.
• Remove sharp debris from tires promptly.
• Avoid operating with underinflated tires.
• Replace damaged inner tubes immediately to prevent sudden air loss.
• Store spare tubes in a cool, dry location away from direct sunlight, ozone sources, and petroleum-based products to maximize service life.