Race Face BOSCH G4 e-MTB Direct Mount Shimano 12 Speed Chainring (34T / 36T)

The Race Face BOSCH G4 e-MTB Direct Mount Chainring is built specifically for modern full-power eMTBs using Bosch Performance Line motors and Shimano 12-speed drivetrains.

Designed for riders who prioritise durability over disposable drivetrain parts, this chainring uses a tough steel construction that handles the increased torque, wear, and constant load that eMTBs create far better than lightweight alloy alternatives. Race Face specifically built this for the “increased loads and forces of full-power e-bikes,” making it a far smarter real-world option for aggressive trail and enduro riders.

It mounts directly to:

• Bosch Gen 4 Performance Line CX
• Bosch Gen 5 Performance Line CX
• Bosch Performance Line SX

using the Bosch direct mount interface, creating a clean, strong, OEM-level fit without additional spiders or adapters.

The narrow-wide tooth profile is optimised for Shimano 12-speed Hyperglide+ chains, improving chain retention and helping eliminate dropped chains under load. This is particularly important on aggressive eMTB riding where motor torque and rough terrain expose weak chain retention quickly.

Available in:

• 34T
• 36T

with both:

• 52mm chainline
• 55mm chainline

options available, allowing proper setup depending on your frame and motor configuration.

This is one of the best “fit and forget” drivetrain upgrades for Bosch riders.

Key Features

• Compatible with Bosch Gen 4 & 5 Performance Line CX and SX motors
• Designed specifically for full-power eMTB use
• Shimano 12-speed Hyperglide+ compatible
• Narrow-wide tooth profile for strong chain retention
• Tough steel construction for maximum durability
• Direct mount Bosch interface
• Available in 34T / 36T
• Available in 52mm and 55mm chainline options
• Heat-treated steel construction for wear resistance
• Lightweight 3D design improves strength without excess weight
• Approx. weight: ~201g

Torque Collective Insight

This is exactly the type of product that makes sense for real-world eMTB riders.

Most riders destroy alloy chainrings too quickly.

Steel wins.

Especially on:

• Orbea Wild
• Trek Rail
• Norco Range VLT
• Cube Stereo Hybrid
• Whyte E-160
• Bosch-powered enduro bikes

…this is the smarter choice.

34T = best all-round option

Best balance of:

• climbing support
• cadence
• trail speed

36T = stronger riders / faster terrain

Better for:

• flatter terrain
• stronger riders
• higher-speed trail riding

This pairs perfectly with your Race Face cockpit offering and gives customers a proper drivetrain option that feels premium without silly pricing.

Fit & Sizing

Chainline Options

• 52mm
• 55mm

Compatibility

• Bosch Gen 4 CX
• Bosch Gen 5 CX
• Bosch SX
• Shimano 12-speed HG+ chains only

Important Note

This is for:

Bosch + Shimano 12-Speed

It is not for:

• SRAM T-Type
• SRAM Eagle Transmission
• analogue MTB cranksets
• non-Bosch systems

That distinction matters.