9 speed is bollocks, back to 7 speed

I had to replace my stretched chain today because it's measured stretched and it doesn't bastard work so I;'m going to have to chan ge my bastard cassteet again and I oin;y changed them 5 minutes ago. Bastard.

So, retro fit to 7 speed and everything is 7 9ths fatter and lasts equivalently 7 9ths longer. Yes?

How come there are still 7 speed freewheels from the 70s that have done a million miles that still work and...fill in your own beer flavoured nostalgia that's not as good as it used to be here:

Funny I have had a 10 speed chain that has lasted like 3 years now.