When we were there their was a hiker biker site on Lake McDonald named Sprague Creek, I recommend it and a swim in the lake. With a reasonably early start you shouldn't have a problem making it to the top of the pass in time.
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I'll second the "D" road or "white road" suggestion. You just can't go wrong in France riding roads which are white on a Michelin 1:200000 scale.
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