SAN DIEGO (BRAIN) — Stromer will give away a limited-edition ST1 e-bike to one winner after next weekend’s Electric Bike Expo in San Diego.To qualify, expo attendees need to test ride a Stromer and sign up for the drawing. Stromer will also be giving away two gift bags. Winners will be notified by email or phone by March 4.The Electric Bike Expo runs from Feb. 26-28 at Liberty Station, 2722 Chauncey Road, San Diego. Stromer is among 18 brands that will be exhibiting pedal-assist e-bikes at the event.