The cyclist’s conjecture
n’ = n+1 for n=1..∞
states that n’, the number of bikes that a cyclist needs, is always one more than n, the number (s)he already owns, for any value of n.
That’s my way of saying “I’ve just bought another one”!
My oldest road bike is almost vintage having been bought in 1992. I used it in a group ride about four years ago only for a lycra-clad short-a**e riding a carbon-fibre bike to sneeringly tell me that “You don’t see many of them nowadays” …

… which is why I was rather pleased to win a modern aluminium-framed bike a year later with carbon forks and a Campagnolo gearset. It’s amazing what the purchase of a shrink-wrapped block of Wensleydale cheese can lead to – I’d bought a promotional competition pack to mark the Tour de France’s Grand Départ from Yorkshire.

So why buy another bike? Simples! The road bikes are terrific for tarmac, but not so good over slightly rougher surfaces and my travels with Priscilla (posts passim) lend themselves to both tarred and non-tarred outings. So I need a bike for each (of course I do).
The new one is of the ‘adventure bike’ genre: carbon forks with generous tyre clearance for fatter tyres, disc brakes and reduced gearing on the chainset (ideal for a moderately overweight recreational cyclist aka a MORC), but with road bike geometry and clearance for mudguards it makes for an ideal winter bike too. Win-win!

Postscript: I was given a road bike for my 21st birthday, but remember little of it other than its saddle was nicked when it was securely racked outside a hall of residence in Dundee. Some while later the rest of it was nicked too.
I wondered at the time whether the thief followed the advice that I was given when I asked a girl off my course (who I thought of as a rather reserved and quiet lass): “How can I ride it without its saddle?” Reserved and quiet maybe, but also blunt, coarse and to the point: “Stick it up your a**e and pedal like f**k!” she said. I never saw her in the same light again!