1) ultra-light bikes are cheaper than I thought - £1500 ($2100, €2000) gets one a decent bike if one shops around and picks one up on a discount.
2) beware of the mid-life crisis.
Anyway, about 3/4 of the way through the ride I came upon a conveniently placed bench just outside Oving. So I sat down and admired the view over the valley.
Pootling about on country roads, and enjoying the view.
Not tearing around with my chin on the handlebars with a permanently stiff neck.
I like a luggage rack on the back of a bike, because I can hang a pannier on it, with a flask of tea and a box of sandwiches being transported to the various benches of Buckinghamshire and Hertfordshire where I can enjoy the view. (There is a nice bench up near the reservoir between Cuddington and Quainton, too).
Surely a robust, heavy, bike would be ideal.
Nothing like a cheap bike to take the salt from the roads, and the weight helps to toughen you up, too.
And a bit of audax/randonneuring.
1) one of those adjustable, pivoting, stems, so the height of the bars can be easily altered. I have one that does a +50 to -10 degree angle. Bars high for commuting, shopping, and touring. Bars mid-level for audax/randonneuring. Bars low for sportives.
2) lightweight tyres. Keep the Marathon Plus for commuting, shopping, training and touring, with a set of MUCH lighter tyres (like Schwalbe Ones) for audax/randonneuring and sportive. The weight saving will be substantial - about 1300g just for a switch from my 37-622 M+ to a pair of 28-622 Ones! Substantially lower rolling resistance as well.
3) lightweight wheels. Keep the M+ tyres on my existing Mach 240 rims, and mount the lightweight tyres on the lightweight wheels. Heavy wheels for commuting, shopping, training and pootling about in the countryside, lightweight wheels for audax/randonneuring and sportives.
Again, it is not hard to find a modestly priced wheelset that saves about 500g on my existing behemoths.
4) water bottle cages are going to start sprouting all over Mermaid. The bike currently doesn't even have a bottle cage, although there are fitting for one. The others will be attached with some of those universal adapter kits one sees advertised.
5) For sportives, Mermaid will be losing the mudguards (fenders). Not sure how heavy they are, but they are steel (oh!), and certainly not minimalist racing jobs. 500 to 1000g sounds like a likely range.
6) Mermaid might be going 9-speed, but I haven't decided on that yet. I have a BNIB 9-speed derailleur I picked up very cheap a couple of years ago, so it wouldn't cost much. My existing 8-speed set up has an 11-32 rear cassette, but the lowest gears are spread 21 26 32 which are quite large gaps. The equivalent 9-speed cassette runs 21 24 28 32 which is nicer. I'll have to see if I can pick up a cheap shifter.
And the mid-life crisis can wait another year ;-)
Mermaid needed quite a bit spent to replace worn out parts.