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The Electro CX S is a compact direct-mount chain guide for Bosch Performance Line CX e-bikes (Gen 4 & Gen 5). Keeps your chain in place on 30–36T chainrings with a 55 mm chainline, adjustable to 53.5–56.5 mm with included spacers.
The guide mounts directly to the Bosch drive unit using a single 4 mm Allen key — no crankset or drivetrain removal required. This keeps the setup clean, simple and easy to service.
The backplate is CNC-machined from 7075 T651 aluminium, black anodized and laser engraved. Guide plates are moulded from high-impact polyamide (PA6). The result is a stiff, durable and lightweight component that integrates seamlessly with modern e-MTB drivetrains. Weighs just 22 g.
Compatible with Bosch CX motors: Gen 4 (BDU37xx family) and Gen 5 (BDU384Y, BDU386Y).
EAN
SKU
Electro CX S – chain guide for Bosch CX Gen 4 & Gen 5 (30–36T)
Key features
- Compact chain guide for Bosch Performance Line CX e-bikes (Gen 4 and Gen 5)
- Designed for short- and mid-travel e-bikes
- Compatible with 30–36T chainrings, 55 mm chainline (adjustable to 53.5–56.5 mm with included spacers)
- Prevents dropped chains on rough terrain and demanding e-MTB trails
- Direct-mount to the drive unit — no crankset removal required
- CNC-machined backplate from 7075 T651 aluminium, black anodized and laser engraved
- Guide plates moulded from high-impact polyamide (PA6)
- Lightweight: 22g
Description
The Electro CX S was developed for Bosch Performance Line CX e-bikes ridden hard — on technical climbs, loose trail surfaces and fast descents where standard chain retention is not enough.
The direct-mount interface attaches to the Bosch drive unit with a single 4 mm Allen key, requiring no crankset or drivetrain removal. This keeps the system simple to install and straightforward to service in the field.
The compact form factor is intentional — designed to suit short- and mid-travel e-MTB frames without compromising ground clearance or clean integration. At 22 g, it adds meaningful chain security without measurable weight penalty.
The backplate is CNC-machined from 7075 T651 aluminium, black anodized and laser engraved. Guide plates are moulded from high-impact polyamide (PA6), chosen for its combination of impact resistance, low friction and durability under repeated chain contact.
Compatibility with Bosch Performance Line CX motors
Electro CX S is designed for Bosch Performance Line CX mid-drive motors. To confirm compatibility, check the BDU number on the motor housing or in your bike’s manual.
Generation 4
BDU37xx family: BDU3741, BDU3742, BDU3743, BDU3760, BDU3761, BDU3780, BDU3781, BDU374Y, BDU376Y, BDU450CX, BDU490P, BDU480
Generation 5
BDU384Y, BDU386Y
If you are unsure about fitment, contact us and we will help verify compatibility.
OEM & trade inquiries
Electro CX S is specified on selected bikes from Kross bicycles. For OEM inquiries, custom projects or volume pricing, please contact us or register for a business account.
Technical data
The Electro CX S is a compact direct-mount chain guide for Bosch Performance Line CX e-bikes (Gen 4 & Gen 5). Keeps your chain in place on 30–36T chainrings with a 55 mm chainline, adjustable to 53.5–56.5 mm with included spacers.
The guide mounts directly to the Bosch drive unit using a single 4 mm Allen key — no crankset or drivetrain removal required. This keeps the setup clean, simple and easy to service.
The backplate is CNC-machined from 7075 T651 aluminium, black anodized and laser engraved. Guide plates are moulded from high-impact polyamide (PA6). The result is a stiff, durable and lightweight component that integrates seamlessly with modern e-MTB drivetrains. Weighs just 22 g.
Compatible with Bosch CX motors: Gen 4 (BDU37xx family) and Gen 5 (BDU384Y, BDU386Y).
Description
Key features
- Compact chain guide for Bosch Performance Line CX e-bikes (Gen 4 and Gen 5)
- Designed for short- and mid-travel e-bikes
- Compatible with 30–36T chainrings, 55 mm chainline (adjustable to 53.5–56.5 mm with included spacers)
- Prevents dropped chains on rough terrain and demanding e-MTB trails
- Direct-mount to the drive unit — no crankset removal required
- CNC-machined backplate from 7075 T651 aluminium, black anodized and laser engraved
- Guide plates moulded from high-impact polyamide (PA6)
- Lightweight: 22g
Description
The Electro CX S was developed for Bosch Performance Line CX e-bikes ridden hard — on technical climbs, loose trail surfaces and fast descents where standard chain retention is not enough.
The direct-mount interface attaches to the Bosch drive unit with a single 4 mm Allen key, requiring no crankset or drivetrain removal. This keeps the system simple to install and straightforward to service in the field.
The compact form factor is intentional — designed to suit short- and mid-travel e-MTB frames without compromising ground clearance or clean integration. At 22 g, it adds meaningful chain security without measurable weight penalty.
The backplate is CNC-machined from 7075 T651 aluminium, black anodized and laser engraved. Guide plates are moulded from high-impact polyamide (PA6), chosen for its combination of impact resistance, low friction and durability under repeated chain contact.
Compatibility with Bosch Performance Line CX motors
Electro CX S is designed for Bosch Performance Line CX mid-drive motors. To confirm compatibility, check the BDU number on the motor housing or in your bike’s manual.
Generation 4
BDU37xx family: BDU3741, BDU3742, BDU3743, BDU3760, BDU3761, BDU3780, BDU3781, BDU374Y, BDU376Y, BDU450CX, BDU490P, BDU480
Generation 5
BDU384Y, BDU386Y
If you are unsure about fitment, contact us and we will help verify compatibility.
OEM & trade inquiries
Electro CX S is specified on selected bikes from Kross bicycles. For OEM inquiries, custom projects or volume pricing, please contact us or register for a business account.
