A lightweight, affordable 104BCD chainring for e-bike builds, matched to any 104BCD e-bike spider or e*thirteen's own Turbocharger spider-bashguard assembly.

Highlights

  • 104BCD, 4-bolt
  • Forged-CNC 7075 aluminium
  • M4 narrow-wide tooth profile for chain retention
  • Cross-compatible with Shimano, SRAM and TRP 11/12-speed, including T-Type
  • Black, 32T or 34T

Compatibility & fit

Fits any 104BCD 4-bolt e-bike spider, including e*thirteen's Turbocharger spider-bashguard assembly for TQ, Fazua, Bosch SX and DJI Avinox motors – the chainring itself has no motor-specific offset, so fit comes from the spider you pair it with. Runs on Shimano, SRAM and TRP 11/12-speed drivetrains, including SRAM T-Type. The Tune workshop can fit it as part of an eMTB drivetrain service.

Options

TeethWeight
32T43g
34T56g
e*thirteen's standard warranty covers this product for 10 years against manufacturing and material defects; normal wear, crash damage and misuse aren't covered, though e*thirteen's Infinite Ride programme offers a discounted replacement after a crash. 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, so keep your proof of purchase.
  • 104BCD, 4-bolt
  • Forged-CNC 7075 aluminium
  • M4 narrow-wide tooth profile
  • Shimano/SRAM/TRP 11/12-speed, incl. T-Type
  • 32T or 34T
Brande*thirteen
ModelHelix e*spec 104BCD
Bolt pattern104BCD, 4-bolt
Material7075 aluminium
ColourBlack
Compatibility104BCD e-bike spiders, incl. e*thirteen Turbocharger spider-bashguard
ChainShimano/SRAM/TRP 11/12-speed, incl. T-Type
Teeth options32T / 34T
SKU DTW-ETG-CR5HAA-10-PAR
Brand e*Thirteen