You mean your mountain bike does not have something invested in the outcome?
But I can sympathize with your wife's concern. My husband likes irritating things like mountain biking on empty trails in the snow, or kayaking at night. One evening, he said he'd be back around 9 from a late night kayak, and showed at 1030, by which time I was climbing the walls in worry. He walked in, beaming at his fun evening. My response: "This is a cellphone. Use it."
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Zero gallons to the mile