Elosix adaptor, comes with an M8 bolt, a washer, a spring washer and a square nut.
Mounted on a Dahon Mu Uno, with 1.75" tires on 20" wheels.
Using the double nut method of securing the bolt to prevent self-loosening.
Stock kickstand can still be mounted. A longer M8 bolt is required to thread through the kickstand and the Elosix adaptor.
Sufficient clearance with the left side crankarm
This mod is necessary for this Dahon Mu Uno, as the frame does not have any V brake mounts. Caliper brakes also cannot be mounted on the bridge between the seat stays as the seatstays are very tall and blocks the caliper brake arms. In the end this is the only viable method of mounting a rear brake on the Mu Uno frame.
Using this adaptor for 451 wheels might be possible, if slim tires are used. The frame may also affect the fitting of this adaptor. I have heard that this adaptor does not work on Tern bikes with 451 wheels due to interference. However, it may still work for Dahon bikes with 451 wheels.
The adaptor is made of aluminium, but it does look a little weak. It has been tested by riding and it works nicely, but I am not sure of the strength. Perhaps it would be a better idea to make the adaptor out of thicker aluminium or steel. After all, this adaptor is critical for braking and it must not crack or deform under load.