Rear wheel, 26 inch, ryde 40 rim, HD Enviolo hub, solid axle

Standard spec for Urban Arrow and other cargo bike brands…

Rear wheel, 26 inch, ryde 40 rim, HD Enviolo hub, Suit Urban Arrow, Babboe, Riese and Muller.

if you are replacing an older hub like a N330/N380 city (CT) or Trekking (TR) then you will also (probably) need a new shifter (comes with new cables) and definitely a new hub interface. we can supply these.

https://www.reallyusefulbikes.com/enviolo-manual/p/manual-controller-twist-with-display-pure

https://www.reallyusefulbikes.com/enviolo-manual/p/enviolo-spca-cargo-manual-hub-interface

pretty much a straight swap.