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Tarbert-Portavadie ferry links the Kintyre and Cowal peninsulas with a fairly regular service through the day all year. This is one of the few remaining coastal ferry services (i.e. not island) in Scotland. The road alternative to the head of Loch Fyne is about 100miles in total. The ferry service links the Sustrans routes 75 and 78.
Bikes travel free on all Calmac services and no reservation is required. The only slight downside is the the slipway onto the ferry is too slippery to ride hence they do insist that cyclists wheel their bikes onto and off the ferries