The B95 and B105 models were launched at the 1959 Geneva Motor Show and boasted more power from twin-cylinder Royal Enfield 692 cc four-stroke engines, with the Super Meteor engine in the B95 and the Constellation unit in the B105 which could reputedly exceed mark. The engines featured Berkeley-design primary chain cases to accommodate a Lucas Bendix starter motor, an external Lucas dynamo mounted above the gearbox, and a duplex (or double-row) chain drive to the differential. Kerb weight increased to . B95 engine numbers have the unique prefix 'SMTB', while B105 engines are prefixed 'SMUA'.