Collection: Rear Derailleur

Smooth Transitions, Maximum Range: Bicycle Rear Derailleurs

Keep your drivetrain running at peak performance with a high-quality rear derailleur. As the "brain" of your gear system, the rear derailleur is responsible for moving the chain precisely across the cassette while maintaining proper tension. Whether you're a mountain biker needing a wide-range climb or a road cyclist looking for snappy, close-ratio shifts, choosing the right model is essential for a smooth ride.

Because rear derailleurs must match your shifters and cassette perfectly, there are several key factors to check before you buy.

Essential Compatibility Guide

To ensure you select the correct rear derailleur, you must match it to your bike’s current configuration:

1. Cage Length Explained

The "cage" is the arm that holds the pulley wheels. The length determines how much slack chain the derailleur can take up:

• Short Cage (SS): Ideal for road bikes with small cassettes (e.g., up to 28t or 30t) and double chainrings.

• Medium Cage (GS): Common for "compact" road setups or gravel bikes using larger cassettes (e.g., up to 34t).

• Long Cage (SGS): Required for mountain bikes and triple-chainring setups to accommodate massive gear ranges (e.g., 42t to 52t).

2. Mounting Styles

• Standard Hanger Mount: The most common type; it bolts into a replaceable derailleur hanger on the frame.

• Direct Mount: Found on modern Shimano "Shadow" systems; it attaches further back on the frame for better shifting and wheel removal.

• Claw Mount: Found on older or entry-level steel frames where the derailleur slides directly onto the wheel axle.

3. Clutch Mechanisms (Optional Feature)

Many modern mountain and gravel derailleurs feature a clutch. This keeps the chain tight on rough terrain, preventing it from slapping against the frame or falling off.

Still Unsure? Get Professional Help!

Matching the correct rear derailleur involves calculating "drivetrain capacity" and ensuring brand-specific pull ratios are identical. If you have any doubts about which speed, cage, or mount your bike requires, don't leave it to chance.

Contact Live 4 Bikes for professional help. Our team can help you identify your exact specs so you get the right part and the best performance out of your bike.

Would you like me to help you calculate the "total tooth capacity" required for your specific front and rear gear setup?