Line of action #1 - you find common grounds. My wife has no particular interest in cycling, but found value in touring on a bike. Kids were not into cycling, but the younger (5yo) wanted to see Legoland. The older (11yo) wanted to see Amsterdam. So we spent the summer vacations biking across (part of) Europe. This past summer "might" have been it, but we have agreed in principle to another summer-long tour in two years. I should underline the fact that our pre-teen fell to the ground in tears at one point (long, steep hill on a hot day. We were covering 60kms+/day). Asked if she could call it quits and wait for us at her grand parents' place. We said yes, but that she should probably stay a few more days with us. She did. And is now very proud of her achievement. Has been a life lesson. Perseverance. She can now climb the steepest hill while smiling when she overtakes me.

Line of action #2 - you take a few weekends on your own. (most likely your kids will want to tag along, eventually). Probably healthy to agree on activities that do not always involve everyone. Obviously, expect that your wife will also take some time for herself.

Line of action #3 - Two months -- I assume that you are a teacher. if your wife is also in that kind of business, see #1. If you are not free to take 2 months off (i.e. a long tour means quitting your job) you may want to start talking about something really out of the ordinary (I raise, from time to time, the idea of riding the Silk Road. One of my students, this semester, comes from Urumqi. Might be the trigger that we needed.) By taking the idea of bike touring to the next level, it could become the trip of a lifetime. I mean, riding from Nantes to Berlin made for a great summer vacation. But riding the Silk Road is something entirely different. Something that I would not consider with a 3yo. But this (or another outrageous plan) may motivate your family to take steps in that direction.

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I don't know... here we pin a map on the wall and start dreaming...