Bosch BDU4xx Bearing Protection Ring Kit

The Bosch service kit with bearing protection rings for BDU4xx motors restores the L1 and L3 seats in the motor unit. It is designed for those maintaining their own eBike or for workshop use.

• Protects the bearing and motor housing at positions L1 and L3
• Prevents mud and dirt from entering the motor unit
• Includes everything: L1 and L3 rings with retaining rings and tool
• Compatible with BDU4XX and BDU37YY motors
• Before ordering, check that your motor is BDU4XX or BDU37YY

Technical specifications

• Item code: 1270020160
• Compatibility: BDU4XX and BDU37YY
• Contents: 1 L1 bearing protection ring with retaining ring; 1 L3 bearing protection ring with retaining ring; 1 lifting tool
• Bearing positions covered: L1 and L3
• Intended use: City, VTT, Touring & Trekking

Founded in Germany in 2009 as a start-up within the Bosch Group, Bosch eBike Systems is now based in Kusterdingen. It develops motors, batteries and on-board computers to support e-bike riders. In 2010, it presented its first electric bicycle drive system at Eurobike.