Race Face Bosch G4 e-MTB 12-Speed Chainring 34T/36T

Race Face Bosch G4 eMTB Direct Mount Chainring — Built for Full-Power Motors

The Race Face Bosch G4 eMTB Direct Mount Chainring is engineered specifically for modern full-power eMTBs running Bosch Performance Line motors and Shimano 12-speed drivetrains. Where lightweight alloy chainrings struggle under constant high-torque motor loads, this chainring uses a steel construction built to handle the increased forces that full-power eMTBs generate — meaning fewer skipped teeth, less stretch-induced wear, and a longer service life between replacements.

What It Does

The chainring mounts directly to the Bosch direct mount interface — no spider, no adapter — creating a clean, solid fit on:

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

The narrow-wide tooth profile is optimised for Shimano 12-speed drivetrains, promoting positive chain retention under power. Available in 34T and 36T at the 52mm offset, and 34T and 32T at the 55mm offset — ensuring compatibility across different Bosch motor generations and frame chainstay configurations.

Sizing & Fitment Guide

Two chainline offsets are available: 52mm and 55mm. Check your motor generation and frame manufacturer's recommended chainline before selecting. Tooth count options are 32T, 34T, and 36T — a larger ring gives a higher top-end speed, a smaller ring improves low-speed torque and climbing traction.

Why Torque Collective Stock This

eMTB drivetrains take punishment that standard MTB components aren't designed for. Bosch-powered bikes demand chainring materials that match the motor's output, and Race Face's steel G4 ring addresses exactly that. It's a straightforward, durable upgrade or replacement for any Bosch Performance Line eMTB running Shimano 12-speed — and a sensible stock item for our workshop and any rider wanting to reduce drivetrain downtime.