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Existing routing protocols such as AODV were used to simplify the shortest path metric. It assumes that all link quality must be the same. It does not consider link quality such as bandwidth, packet loss rate, packet size, etc. Several performance metrics that consider different link quality for WMNs such as ETX and ETT. Although, these metrics can provide more effective performance than the hop count metric, they did not consider the backbone feature of WMNs. In this paper, a new routing metric for load balancing in WMNs is proposed. These routing metric is called Expected Transmission Time - Load Balancing (ETT-LB) and this metric is using ETT and Bandwidth usage.