Callum I have a Fat Tyre E Bike and using the top 2 assists only get 25 miles on a mix of hilly lanes and main roads . I inflate the 20X4 Kenda on the rear to about 29 psi and the front Chaoyang Sand/Road profile tyre to 25 psi . On the same routes with a Quartz 20 in. Folder I can reach nearer...