When black-line "Flex Rig" braking on flat roads, you will stop a lot sooner than rim-brake bikes, standing on the pedals and slipping sideways will advance this even faster, be aware. Fit strong walled correct tyres, and inflate to maximum as tyre pressure affects distance travelled, use anti puncture inner tube slime, fitted by a bike shop for trouble free commuting. Knobbly tyres grip and improve stair climbing, smooth tyres slip on the corner of stairs when wet.
Silent free-run motor will take you to 15mph in bicycle mode and 25mph in moped mode (chassis number permitting) with the right tyre fully inflated on flat roads only.