Pedal Power
So, you have been turned on to this e-bike thing – good for you! We are stoked to offer an eMTB Spider to run 104BCD rings on your e-bike. This spider is only compatible with the Bosch Gen 4 Performance Line CX and SX motors. Any Race Face 1x 104BCD ring will mount securely with the included hardware. - including our new SHI-12 speed rings!
eMTB Spider – Bosch G4 104BCD
Specs
| Compatible With | 104 BCD 4 arm cranks |
| Material | Aluminum |
| Compatible With | Bosch Gen 4 & 5 Performance Line SX and CX motors (Gen 5 CX will need spacer installed for 55mm chainline) |
| eMTB Built | Built for compatibility constraints and increased loads/forces of full-power e-bikes. |
Frequently asked questions
Does the spider support standard 104BCD rings?
Yes, this eMTB spider is specifically designed to allow the use of standard 104 BCD 4-arm chainrings on your Bosch Gen 4 e-bike motor.
This broad compatibility supports all Race Face 1x 104BCD rings, including the newer SHI-12 speed compatible rings.
Is this spider specifically reinforced for electric bike power?
Yes, it is part of the eMTB Built product line. This means it is precision-engineered from high-strength aluminum to handle the unique mechanical stresses and higher torque output of modern full-power electric mountain bike motors.
Is this spider compatible with various Bosch motors?
Yes, this spider is designed for compatibility with Bosch Performance Line SX and CX motors (Gen 4 and Gen 5 systems). It is built from durable aluminum to handle the high torque demands of these e-bike motors while allowing you to use standard 104BCD 1x chainrings for drivetrain customization.
Compatibility Note:
- The spider is designed for a 52mm chainline.
- If you are installing this on a Bosch Gen 5 CX motor, please note that an additional spacer is required to achieve the necessary 55mm chainline.
Is mounting hardware included?
Yes, the Race Face eMTB Spider includes all required mounting hardware to securely install your 104BCD chainring onto the Bosch Gen 4 motor system.
Does installation require any special mechanical expertise?
Yes, installing the eMTB Spider does require some mechanical knowledge as it involves working directly with the e-bike motor interface. It is essential to ensure the component is securely attached to the motor spindle for optimal power transfer and safety. If you are not familiar with e-bike drivetrain maintenance, we recommend having a professional mechanic perform the installation.
What is the standard chainline for this product?
The spider features a 52mm chainline by default. This is the baseline measurement designed for most standard Bosch Gen 4 and compatible configurations.
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