A direct-mount replacement or upgrade chainring for Bosch Gen4/SX-equipped e-bikes, in e*thirteen's narrow-wide profile for secure chain retention.

Highlights

  • 32-tooth direct-mount chainring for Bosch CX Gen4/SX motors
  • 53mm chainline on Bosch CX Gen4/SX
  • Narrow-wide tooth profile for secure chain retention
  • Cross-compatible with Shimano, SRAM and TRP 11/12-speed drivetrains, including SRAM T-Type
  • Forged, CNC-machined 7075 aluminium

Direct fit, no spider

This is a one-piece direct-mount ring with a metal dust cover that keeps seal and lockring contamination down, built specifically for the Bosch Gen4/SX motor interface rather than a universal spider mount.

Compatibility & fit

Fits Bosch CX Gen4 and Bosch SX direct-mount e-bike motors only — check your motor before ordering. 53mm chainline on this interface. Works with Shimano, SRAM and TRP 11/12-speed chains and derailleurs, including SRAM T-Type. The Tune workshop can fit it.

e*thirteen covers the Helix Race e*spec chainring for 10 years against manufacturing and material defects, plus a discounted crash replacement policy. For warranty support, return the product to Tune Cycles and we'll manage the claim with e*thirteen's Australian distributor. This is in addition to your rights under the Australian Consumer Law. Keep your proof of purchase.
  • 32T direct mount, Bosch CX Gen4/SX
  • 53mm chainline
  • Narrow-wide profile
  • Forged 7075 aluminium
Brande*thirteen
ModelHelix Race e*spec
Teeth32T
Motor fitmentBosch CX Gen4 / SX, direct mount
Chainline53mm
MaterialForged CNC 7075 aluminium
Drivetrain compatibilityShimano/SRAM/TRP 11-12sp, SRAM T-Type
ColourNaranja
SKU DTW-ETG-CR5ERA-106
Barcode # 4711280341153
Brand e*Thirteen