FSA

W0138A00ZZE400 Bosch Gen 4 Boost Spider BCD104 53mm Chainline for Boost Hubs

The FSA W0138A00ZZE400 Bosch Gen 4 Boost Spider is designed for riders who demand dependable performance from their eBike drivetrain. Built from durable alloy, this spider delivers the right mix of stiffness and strength to handle the higher torque loads of Bosch Gen 4 motors while maintaining a responsive feel on every ride.

With a BCD104 interface and a 53mm chainline optimized for Boost hub spacing, it ensures precise chain alignment and efficient power transfer. Whether replacing a worn component or fine-tuning a drivetrain setup, this spider keeps your eBike pedaling smoothly and reliably.

• Compatible with Bosch Gen 4 eBike motors
• Boost 53mm chainline for modern frame spacing
• BCD104 mounting pattern fits a wide range of chainrings
• Alloy construction balances weight, stiffness, and durability
• Built to handle the increased torque of eBike systems