The E-bike Chainring Lock Ring Tool for Brose Motor Drive S and Bosch Gen.3 Gen4 Performance CX is a specialized tool designed to install or remove the chainring locking ring system on e-bikes equipped with Brose Motor Drive S and Bosch Gen.3 Gen4 Performance CX engines. This tool is crucial for the maintenance and repair of these e-bike drive systems and makes work much easier. Key features of the tool: Compatibility: The tool is specially designed for e-bikes with Brose Motor Drive S and Bosch Gen.3 Gen4 Performance CX drive systems and fits perfectly with the locking rings of these engines. DURABLE DESIGN The tool is made of high quality material and is constructed to withstand the demands of e-bike maintenance. It is durable and reliable. Easy to use: the tool allows easy installation and removal of the chainring locking ring, which makes maintenance and repair of the drive system much easier. Lockring tool is required for disassembly of the lock ring from the e-bike chainring spider/chainring. For Brose engines Mag SBosch Gen3 + Gen4: Active Line (BDU310) Active Line Plus (BDU350) Performance Line Cruise (BDU365) Cargo Line Cruise (BDU365) Cargo Line Cruise. BDU45 0 CX) Cargo Line Speed (BDU490 P) Performance Line Speed (BDU490P) Performance Line CX (BDU450 CX) Can also be used for Brose engines is required to loosen the lock ring. Outer diameter 41.5 mm, inner diameter teeth 37 mm, inner diameter bore 31.9 mm - 4.5 mm, inner diameter bore 23, 8 teeth, 4 x 5 mm. Box contents: 1 x mounting nut. Some crank arms without integrated puller require a crank arm puller e.g. EAN: 4251111554432. Some chainring screws still require a locking tool for loosening. EAN: 4251111556313 tool as well as Nerrow chainrings, Hope Ebike crank arms and other wear parts can also be found here in our shop