Sturmey Archer? 3 speeds? What wouldn't I have given for 3 speeds. I used to have to cycle over the Downs on a no-speed anvil.
I h I have friends who do mtb on ridged single speed 29",,, but they are special.............. are you ?
i used to dream of a Grifter, i had to make do with a Moulton Mini... check out the front suspension...
My brother had single speed fixed wheel hub. No ratchet. When you went down hill you had to lift your feet clear of the peddles or get your ankles broken.