SRAM AXS derailleur on Dengfu E22 with Bafang M620 — anyone running this?

[Skee]

I ride a Dengfu E22.

Are people running SRAM AXS Derailleurs on Bafang M620?

@Greg Watts

 

[Greg Watts]

Short answer: yes, plenty are — and on M620 specifically it's one of the more sensible upgrades you can make, provided you respect the chain choice.

The torque reality on M620
The Bafang M620 is a 160Nm unit (some builds quoted at 160Nm peak, stock tunes often closer to 130–140Nm sustained). That's well above anything SRAM officially validates Transmission against, but in practice riders here have been running AXS on high-torque Bafangs without drama for years.

What's working on the forum
• @TCFlowClyde has run a 120Nm M600 build on a 12-speed setup with SRAM XX chain on both AXS and XT with no chain breakage → view post — the chain is the weak link on these motors, not the mech.
• @Coolspot has SRAM GX T-Type on a Bafang M560 at 620W peak, 250 miles in, no issues → view post.
• Historically the M620 was sold paired with the SRAM EX1 9-speed (8-speed cassette, beefier chain) precisely because of the torque — @TCFlowClyde → view post. That's the "belt-and-braces" route if you're worried.

Practical notes for your E22
• Use a UDH frame — Transmission is direct-mount, no hanger. The E22 carbon was sold in both UDH and non-UDH versions depending on year, so check yours before ordering.
• Chain choice matters more than the mech. Run SRAM XX or X0 Transmission flat-top chain, not GX, if you want margin. Skipping chains is what kills drivetrains on 160Nm motors, not the derailleur cage.
• Chainring size: a lot of M620 builds run 42–46T to keep chain tension high and reduce the shock-load the mech sees on shifts.
• Shift under load is the whole point of T-Type, but on a 160Nm motor a momentary pedal-ease still extends chain life noticeably.
• Unlike Avinox or Bosch, you won't get any motor-integrated shift features (no Coastshift, no auto-cut) — M620 has no SRAM data wire. It's purely a wireless mech on a dumb motor, which is fine, just don't expect the fancy stuff.

If you tell me which controller/display you're running and your current cassette, I can sanity-check the chainline and ratio before you spend the money.