Shimano Zee RD-M640-SS Rear Derailleur
Best durable drivetrain upgrade for aggressive downhill mountain bikers.
This is a dedicated gravity workhorse that prioritizes chain security and impact resistance over versatility. By stripping away the range needed for climbing, it gains the rugged, short-cage architecture required to survive aggressive downhill abuse without skipping a beat.
$73.99
at
Play It Again Sports
Who it's for
- Downhill riders seeking reliable performance in harsh, rocky terrain
- Gravity enthusiasts wanting a silent and secure drivetrain setup
- Budget-conscious mountain bikers looking for professional-grade downhill performance
Who should skip it
- Enduro riders needing wide-range gearing for steep technical climbs
- Weight-weenies prioritizing the lightest possible build for their bike
- Riders who prefer a light and effortless shifting action
Performance breakdown
Chain Retention
The clutch mechanism keeps the chain locked down through aggressive rock gardens.
Shift Precision
Crisp, reliable gear changes even under heavy pedaling loads.
Durability
Built to withstand the inevitable impacts of serious downhill riding.
Ground Clearance
Short cage design keeps the derailleur safely tucked away from trail obstacles.
Frame Stiffness
Direct mount interface creates a solid, flex-free connection to the bike.
Weight
Prioritizes rugged construction over shaving grams for the race course.
Key Specs
Drivetrain Speeds
10
Mount Type
Direct Mount
Cage Length
Short
Total Capacity
25 teeth
Clutch
Yes
Intended Use
Downhill/Mountain
Color
Black
Compatibility
Shimano Mountain
Know before you buy
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Ask Metto anything about the Shimano Zee RD-M640-SS Rear Derailleur before you decide.
