FSA DIRECT MOUNT BOOST 38T Chainring (Bosch Gen 3, with guard – Megatooth)
The FSA e-bike Megatooth Direct Mount BOOST 38T chainring is designed specifically for Bosch 3rd generation e-bike motors and optimized for Boost 148 mm rear hub spacing. Its steel construction provides high durability, while the Megatooth tooth profile ensures secure chain retention and efficient power transfer under high e-bike torque loads.
Key features
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Designed for Bosch 3rd generation e-bike motors
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Direct Mount system
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Boost 148 mm compatibility
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Megatooth tooth profile for enhanced chain retention
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Steel construction for high durability
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Integrated chain guard design
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Optimized for 11-speed drivetrains
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Built for e-bike high-torque applications
Technical specifications
| Specification | Details |
|---|
| Brand | FSA |
| Part number | 380-0431002250 |
| Teeth | 38T |
| Type | Direct Mount chainring |
| Material | Steel |
| Motor compatibility | Bosch 3rd Gen e-bike systems |
| Drivetrain | 11-speed |
| Chainline | 55 mm |
| Boost standard | 148 mm |
| Tooth profile | Megatooth |
| Extra | Integrated chain guard |
Compatibility
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Bosch 3rd generation mid-drive e-bike systems
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Boost 148 mm rear wheel spacing
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11-speed drivetrains
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Not compatible with standard MTB or road crank systems
In practice
The FSA Megatooth 38T chainring is engineered for high-torque e-bike use, where reliability and chain retention are critical. Its aggressive tooth profile helps prevent chain drops even on rough terrain, while the steel construction ensures long service life under demanding riding conditions.
