From what I've read the answer would be no. Firstly, hub motors use freewheels which screw on, not cassettes. The Soltera .2 has a grip shifter with indexing for 7 speeds which would have a different spacing then an 8 speed, so it would not play nicely with your derailleur. You can find a 7 speed freewheel that has different size sprockets. Drift Maniac makes an 11 to 34 tooth if you are looking for a smaller high gear and a bigger granny gear. This is popular with ebikers. The price is between $25 and $35 dollars depending on where you pick it up.