TrailMaster M4000 Rear-Dial Derailleur – 8-24 Speed Mountain Bike Transmission Upgrade

Unleash smooth, responsive shifting on every trail with a drivetrain component built to perform when the terrain turns demanding. The TrailMaster M4000 Rear-Dial Derailleur is engineered for cyclists who demand a reliable, adaptable rear transmission—and offers compatibility across 8 to 24 speed systems. Whether you’re tackling single-track or commuting through town, this derailleur delivers consistency and control when it counts.

Key Features

• Broad compatibility: supports 8-speed up to 24-speed drivetrains for flexibility across bikes and upgrades.

• Durable construction designed to withstand rough terrain and frequent shifting, while maintaining quiet operation.

• Precise rear dial mechanism ensures accurate gear changes under load—ideal for steep climbs or rapid accelerations.

• Easy to fit: designed for mountain bikes and compatible with standard gear setups, making it a solid upgrade or replacement.

• Lightweight design reduces rotational mass and improves overall drivetrain responsiveness.

Why Choose Our TrailMaster M4000 Rear-Dial Derailleur
Many budget derailleur units compromise either compatibility or durability—limiting the number of speeds or failing under intense conditions. This model gives you both: wide speed range compatibility plus build strength for mountain performance. If you want an upgrade that won’t hold you back on the trail, this is a smart pick.

Perfect For (Occasions & Uses)

• Mountain bikers upgrading their existing setup to support more gears or smoother shifting.

• Cyclists commuting or exploring rough terrain who require dependable rear transmission.

• Anyone replacing an old or malfunctioning derailleur and seeking an affordable but quality option.

• DIY bike mechanics or shop owners stocking universal works-with-many options.

How to Use & Care
Install by attaching to the bike’s derailleur hanger, thread and connect your chain and gear cable, adjust B-tension and indexing per usual. Regular maintenance includes cleaning away dirt and grime, checking alignment, and applying light lubricant to the jockey wheels. For best performance, keep the gear cable and housing in good condition and ensure proper gear indexing.

Shift with Precision Today
Choose the TrailMaster M4000 Rear-Dial Derailleur and enjoy smoother rides, more gear flexibility and reliable shifting—whether you’re pushing uphill or cruising down.