The cassette lockring tool by Birzman allows you to remove the chainring/spider lockring on third generation Bosch® e-bike units. This helps you replace worn chainrings or access the drive unit for maintenance works. The CNC-machined tool made of high-quality steel works in combination with a proper socket or combination wrench/spanner and is suitable for different Bosch® 3rd generation drive units (see compatibilities).
Details:
• Lockring tool with 8 notches and Ø 43 mm for Bosch® 3rd generation pedelec drive units
• Compatibility: Bosch® Active Line and Active Plus Line (from MY 2017)
Specs:
• Material: alloy steel, CNC-machined
• Diameter: Ø 43 mm
• Tool mount: 1/2″ square drive (for ratchet wrenches) and 24 mm combination wrench/open-ended spanner
In the box:
• 1x Birzman lockring tool for Bosch® 3rd Generation
Note:
Please note that the Bosch® lockring has a left-hand thread, so you’ll need to turn the wrench clockwise to loosen. Make sure to tighten the lockring to the torque specified by the manufacturer.















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