Read this thread and it helped with my decision. I am leaning toward the Biktrix 1000 pro and the 27.8 3” tires as an option. My use will be having fun on the grass and hard packed dirt trails, and then down our 1mi stone road to the main street for my longer rides. I ride my current non-electric mountain bike about 15 mi a trip and know this may increase my range, is the 17.5 battery upgrade worth it? Also does anyone know if this comes with shift sensing? Thanks.