The Shimano TX RD-TX800 rear derailleur is a solid, dependable component designed primarily for 7 and 8-speed mountain, trekking, and hybrid bicycles. It belongs to Shimano's TX series, which focuses on durability and functionality at an entry to mid-level price point. The RD-TX800’s combination of rugged design and proven Shimano shifting technology makes it an ideal choice for riders navigating mixed terrain, from urban roads to light off-road trails.
Design & Construction
Built to handle a wide range of gear ratios, the RD-TX800 uses a medium-length cage, offering a total capacity of approximately 43 teeth. This cage length supports triple or double front chainring setups paired with a rear cassette of up to 34 teeth. This makes it suitable for riders who need versatility to tackle hills and flats efficiently.
The derailleur body is constructed from a combination of lightweight aluminum and robust steel parts, designed for long-lasting durability without excessive weight. Its black anodized finish offers corrosion resistance, protecting the mechanism from the elements during rainy, dusty, or muddy conditions.
Shimano’s precision-engineered pulley wheels, featuring 11 teeth each, are mounted on a cage that minimizes friction and noise while ensuring smooth chain movement. The derailleur also incorporates a sunken pulley bolt design, which helps keep the chain aligned and tensioned properly throughout gear changes.
Shifting Performance
Shimano’s indexed shifting technology is at the core of the RD-TX800’s smooth and reliable gear changes. The derailleur provides crisp and precise shifts with minimal effort, which is essential for novice riders or those who frequently ride on varying terrain.
The inclusion of a barrel adjuster allows fine-tuning of cable tension, giving riders the ability to adjust for optimal indexing and reduce chain rub or missed shifts. The medium cage design aids in chain management by reducing slack during gear transitions, which also decreases the risk of chain drop or excessive noise on rough trails.
While the RD-TX800 does not include advanced features such as Shimano’s Shadow RD or clutch systems (which reduce chain slap and improve chain retention on aggressive trails), it remains an excellent performer for general cycling needs.
Compatibility and Usage
The RD-TX800 is fully compatible with Shimano’s 7 and 8-speed indexed shifters, making it an easy upgrade or replacement for bikes equipped with those drivetrain speeds. The direct attach mount ensures a secure fit to the bike’s derailleur hanger, maintaining alignment and improving shifting accuracy.
This derailleur is best suited for:
Entry-level and intermediate mountain bikes
Trekking and touring bikes requiring wide gear range compatibility
Hybrid and commuter bikes where reliability and durability are critical
Its gear capacity and sprocket compatibility make it versatile enough to handle most common setups used in these categories.
Maintenance and Durability
Designed with longevity and user-friendliness in mind, the RD-TX800 requires minimal maintenance beyond regular cleaning and periodic cable and derailleur adjustments. Its corrosion-resistant black finish protects against rust and wear, even in wet or dusty environments.
The simple mechanical design allows easy access to the pulley wheels and adjustment screws, which helps cyclists perform routine upkeep and extend the component’s life without professional tools.
