If installing in a basement with exposed beams, be sure to pre-drill a few smaller holes (to avoid cracking) and drill at least 2 inches from the top or bottom (otherwise it will be sold of the house not going through future trials) into the tree. Number 10 wood screws 1 1/4" long are fine. Length may vary but I wouldn't resize more. Probably shouldn't be wall mounted directly as the bikes need width on both sides.
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