Personally if the ride is less than 90 mins I don't bother eating anything. I just take a bottle of water.

If the ride is longer than 90 minutes I will eat 300-500 calories (low fiber) 1 - 3 hours before the ride. I will also consume 200-300 calories per hour on the bike in the form of cytomax in a bottle and powerbars.

My goal is primarily weight loss.