There's only one bike-related thing my wife can't stand, and that is surprise packages in the post, as that smacks of hiding the purchase from her. Of course, if I wanted to hide it, I would get it delivered to my work address!
She is fine with most things, as long as I tell her up front. And she does get to benefit as well:
After riding 60 lovely km around Buckingham yesterday on her beloved nobbly-tyred MTB, she complained about her bike being slow on the road, and having difficulty keeping up with me, and that she would have to cancel her plans for LEJOG, as she'd never be able to manage it.
Today, while she was out, I set up my drop-barred Alfine-geared Amazon to fit her, and lo and behold, it's a lot quicker, and she loves it! Planning LEJOG is back on!
She did mention that if felt a bit excessive to have 2 bikes, a mountain bike, and a road bike.
Until I pointed out that she shouldn't forget the folder, which made 2 already, so now she has 3... Education on the benefits of N+1 is underway!