The Doggo Bike trailer comes with two universal attachments for bikes with a 1/2" (12mm) orifice (similar to a regular kid's bike trailer).
Most bikes and e-bikes are compatible with our 1/2" (12mm) orifice attachments.
As for any other type of bike trailer, please make sure your bike's rear wheel axle is compatible with this attachment size, as certain bikes require a 5/8" (15 mm) orifice (sold separetely).
Note that bikes with a thru-axle system need an adaptor for the above mentioned attachment. This is normally available in specialized bike stores.