Recently, mobile computers have become able to communicate with each other by using a wireless LAN protocol, e.g. IEEE802.11 and HIPERLAN, for supporting various internet services. In case that a mobile computer changes a location with high speed, less messages are exchanged between the mobile computer and the Internet. This paper proposes a novel routing protocol CB-WSCP for a mobile clustered networks in which mobile computers with almost the same velocity and communication with each other by multi-hop transmission form a cluster. Here, communicationbetween a cluster and a base station is available only if a mobile computer in the cluster is within a transmission range of the base station. Hence, it is required to support sporadic communication. For achieving wider bandwidth even though the cluster moves with a high speed, a proposed protocol ahieves switching of gateways and updating of routing tables.