Crank Brothers Synthesis Freehub Body—Shimano HG/Synthesis Base Steel Driver
Best durable replacement for riders maintaining high-performance mountain bike hubs.
A reliable steel replacement driver designed to keep high-end hubs spinning smoothly. It offers a straightforward solution for refreshing a worn drivetrain without needing to replace the entire hub assembly.
$59.99
More Synthesis options
Who it's for
- Riders seeking long-term durability against cassette bite
- Cyclists running standard 8 to 11-speed drivetrain setups
- Budget-conscious owners needing reliable wheel maintenance
Who should skip it
- Weight-focused racers prioritizing fast acceleration
- Mechanics looking for universal hub compatibility
- Performance riders demanding instant engagement
Performance breakdown
Durability
Steel construction resists cassette gouging better than lighter alloy alternatives.
Compatibility
Broad integration with Industry Nine and Crankbrothers hubs simplifies maintenance.
Installation Ease
Straightforward swap process for home mechanics with basic tool kits.
Engagement Reliability
Maintains consistent power transfer under heavy pedaling loads.
Weight Penalty
Steel adds noticeable mass compared to aluminum or titanium freehub bodies.
Component Longevity
Robust build quality significantly extends the service life of your wheelset.
Key Specs
Material
Steel
Part Type
Freehub Body
Freehub Body Type
Shimano HG, XD
Compatibility
I9 Hydra, I9 1/1, and Crankbrothers Hubs
Part Number
16507
UPC
641300165039
MPN
16503
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