Usualy I’ll keep stuff untill it’s worn out/broken, I probably average one new bike a year over the last 5 years, but often that’s just been selling a frame and buying a similar replacement (DMR Switchback evolved into a O-O 456, which evolved into the Pitch).
It all depends on where I am and what I’m doing, I’ve done a lot of driving this year so the Pitch came in handy as I could stopoff in places where it could be used properly. Riding localy I rarely use anything other than the SS-Rigid Swift as it’s all that’s needed. Building up a hardtail for general messing about in the woods and that’ll be bike number 3 in the shed (mountainbikes, theres the BMX’s and road bikes on top of that!).
For all that, the Pitch is a siignificant proportion re-cycled bits, the Swift was 2nd hand and the hardtail was going to be built with old bits but the forks didn’t fit so that was another £270, and all that was available was 15mm axle so that needed a new front wheel, so it may as well be a pair, and the 9s drivetrain eneded up on another bike, the only old bits are the saddle and pedals and they’re on the list to go!