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An ad hoc 802.11 network is by definition a peer-to-peer connection between two wireless stations. Those two stations will use all available bandwidth on the channel they have been configured to use (or have automatically chosen to use).
Data rates depend upon the standards implemented by each station and the rates defined for the Basic Service Set (BSS). For example, 802.11b stations will automatically attempt to transmit data at 11 Mbps, falling back to 5.5, then 2, then 1 Mbps as needed to overcome weak signal. This is known as dynamic rate switching or auto-rate adjustment, and is the default mode of operation for most 802.11a/b/g products. Some products also support specific data rate configuration - for example, connecting only at 11 Mbps, but dropping the association if the connection cannot sustain that data rate.
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