Yes you can ride your bikes from Newport northward. The two north/south roads have no shoulder and are very busy. Local cyclists ride northward on Burmah Rd. to Melville Road Basin where there are several boat yards. This requires finding a route through naval housing, just outside Newport, with numerous turns. From the marinas, getting to the rt. 24 bike lane is relatively easy with a good map.
http://www.tenspeedspokes.com/contac...ore-hours.html Once at the bus depot in Newport, the bike shop is just across the street to the north. They probably have a map of the route to the bike lane on rt. 24.
Bern