The Altis Sigma runs a 97.2V 35Ah Samsung 50S pack — 3,402 Wh — into a hairpin-wound mid motor rated at 25 kW (34 hp) peak through a 450 phase-amp controller. Altis quotes 601 Nm at the rear wheel and 80+ mph on the 19/19 Sigma with its 39-tooth sprocket. The 19/16 Sigma MX swaps to a 44-tooth sprocket, which trades top end for drive and