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@pastry_bot
70gi is probably appropriate for a flat ride, but you might want to take into account any headwind you might face.
There's nothing 'golden' about it. Your speed will depend on your fitness/condition and the distance you have to ride. Ultimately the average Joe will go faster on a lower gear over distance due to fatigue. Choosing your gear based on 'spinning on descents' is a load of bollocks. If you don't like pedalling...