The Bridgestone MX Ultra HD 80/100-21 inner tube is designed for motocross and off-road motorcycle applications that require dependable air retention and durable construction. Built to fit 80/100-21 front motorcycle tires, this heavy-duty tube supports demanding riding conditions across dirt tracks, trails, and varied terrain. Its TR4 valve stem provides a secure inflation connection and helps simplify routine tire maintenance.
This Bridgestone motorcycle inner tube is manufactured for reliable performance under the repeated flexing, impacts, and heat commonly experienced during off-road use. The MX Ultra HD design offers a practical replacement solution for worn, punctured, or damaged tubes while helping maintain consistent tire pressure and handling. Confirm the tire size and valve-stem style before installation to ensure proper fitment with your wheel and tire assembly.
The manufacturer part number and vendor part number are both 549673. Bridgestone branding provides clear identification for service professionals, powersports retailers, and riders seeking a trusted replacement component. Install the tube according to the tire and wheel manufacturer’s recommendations, inspect the tire and rim for damage or debris, and use appropriate mounting practices to help prevent pinching or premature failure. This tube is intended for compatible 80/100-21 motorcycle tire applications and is supplied as a replacement inner tube.
Features:
- Fitment: Designed for compatible 80/100-21 motorcycle and motocross tires
- Product type: Heavy-duty motorcycle inner tube for off-road applications
- Model: Bridgestone MX Ultra HD
- Valve stem: TR4 valve stem for standard inflation and service access
- Brand: Bridgestone
- Manufacturer part number: 549673
- Vendor part number: 549673
- Application: Replacement tube for motocross, trail, and other compatible off-road motorcycle use