EUNORAU M12 to M10 Trailer Hitch Adapter vs Robert Axle Project Kid Trailer Adapter

Both are steel M12x1.25 adapters that give a hub-motor ebike a trailer hitch point, but they are not interchangeable. The EUNORAU M12 to M10 is a short female-to-male converter made for Eunorau bikes and its hunting trailer, and it only works if your trailer hitch takes an M10 male thread. The Robert Axle Project Kid Trailer Adapter (KID218) is the better general-purpose pick: it fits Rad Power, Mahle and Bikemotion hub motors and accepts standard two-wheel child, pet and cargo trailers from Thule, Burley and others, with hitch hardware included. Owners of Eunorau hunting trailers should stay with the EUNORAU part; everyone else towing a mainstream trailer should step up to the Robert Axle Project.

• Choose the EUNORAU M12 to M10 if you ride a Eunorau ebike with an M12 rear hub motor axle and tow the Eunorau Two-Wheels Hunting Trailer or another trailer that mounts on an M10 male thread.
• Choose the Robert Axle Project Kid Trailer Adapter if you have a Rad Power, Mahle or Bikemotion hub-motor ebike and want to tow a standard two-wheel child, pet or cargo trailer.