How much is the buyer willing to pay for it, and how much is it worth to you?
The answer to both questions is "I don't know." I don't want to get rich and I don't want my customer to pay too much.
I will scan many pages but only for use on my website. Thought the information is useful, I rarely use it. I was thinking of listing in on Ebay but not for ten dollars. That does not work well for me anymore.
Anyway, I have lots of vintage books relating to old bicycles. For some reason, I have been finding and setting them aside for years. Come to think of it, I have a lot of vintage books about old motorcycles, also. Perhaps I should let those go on Ebay as well. I even have a complete, almost unused, set of encyclopedias about old motorcycles.
For what it is worth, before I got into my bicycles, I restored antique motorcycles for fun, the last one being a 1934 Indian Big Chief with exposed valve stems moving up and down, in plain view, as that old flat head "V-Twin" rumbled away.