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Bosch Performance CX (Gen 4) Lock Ring Kit

Bosch E-Bike Parts

Bosch Performance CX (Gen 4) Lock Ring Kit


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This item is now sold out & unavailable to order. We will leave this page here as a reference to the specification for this model.

This is the Lock Ring and O-ring kit to hold the front chainring and/or spider onto the motor drive pinion on the Bosch Gen 4 Drive Unit (BDU4XX)

Substantially tougher than the plastic nuts, although be careful not to cross thread the nut on the drive unit assembly.

PLEASE NOTE: If you have a Bosch Classic +, Active Plus or Performance system (Featuring a small sprocket on the front), you will require a different lockring.

We also sell the Bosch Spider Tool to safely remove and replace this nut. Available from our store.

Just to confirm it's to fit the following motor shape. If you require a Classic+ lock ring, you can find it on the dedicated Bosch Classic Lock Ring page.

Bosch Gen 4 CX

Customer Reviews

Based on 6 reviews
Jose Bairos
Great service

Order and arrived fast
Top service.

Richard Kemp
Lock Ring Kit

Accept no substitute, the kit is perfect. It comes in two pieces, both are needed for peace of mind.

Tracey Wilkinson
Good price, availability & quick delivery

One of the very few places that sells the lockring and O Ring together. Good price and delivered quickly.

Richard Pugh
Fast delivery great comms perfect product

For Bosch emtb gen 4 chainring - always fit the O ring, stops the chainring working loose

Rob Gardner

A1+ service