BBB E-bikeMount Bosch Gen3 Chainring Spider (BCR-71E)

BBB E-bikeMount is a specialised chainring spider designed specifically for electric bicycles equipped with third-generation Bosch motors. This high-quality drivetrain adaptation allows the use of standard chainrings with a 4-arm mounting system, significantly expanding the options for adjusting the gear ratio to the cyclist’s individual needs. It is an ideal solution both for those looking to upgrade their e-bike and for those seeking a replacement for a worn original spider.

A key feature of the E-bikeMount is its compatibility with popular chainrings with a 104 mm bolt circle diameter (BCD). This standard is widely available on the market, making it possible to choose from a wide range of chainrings from different manufacturers, with varying numbers of teeth and characteristics. This allows the gear ratio to be precisely adjusted to personal preferences and riding conditions – from steep mountain climbs to fast riding on flat terrain. The spider provides an optimal 52 mm chainline, ensuring smooth and efficient drivetrain operation.

Key features:

• Designed specifically for third-generation Bosch motors

• Compatible with 4-arm chainrings with a 104 mm bolt circle diameter (BCD)

• Optimal 52 mm chainline ensuring efficient drivetrain operation

• Made of durable steel resistant to heavy loads

• Ideal for upgrading or repairing an e-bike drivetrain

• Enables extensive gear-ratio customisation thanks to compatibility with popular chainrings

• Precision manufacturing ensures a perfect fit between components

Specification:

• Compatibility: Third-generation Bosch motors

• Bolt circle diameter (BCD): 104 mm

• Number of arms: 4

• Chainline: 52 mm

• Material: Steel