Bike-sharing service, like Hubway, can provide better access to transit hubs and additional options for trips beyond those provided by public transit--reducing the number of transfers, wait times, and travel time variability due to traffic. In order to quantify the impact of Hubway, we compare durations of trips in the historical data with the corresponding expected travel times by public transit and/or walking obtained using service information from the GTFS feed provided by MBTA. As of September 2012, Hubway has helped its members save over 45,000 hours of travel delay.