Have got a standard inbred 29er frame with karate monkey forks. Would it be possible to fit snow bike wheels in it? just for a giggle in the winter.

Any ideas?

no chance.not sure about the KM forks ,but unlikely bearing in mind that pug wheels are generally built on 135 mm hubs,but pretty sure you won't get a 3.7 endmorph in the rear,whatever rim you use.
get yerself over to mtbr,there's a mine of info over there if you search.
some folks use 3.0 dh tyres,but they're seriously heavy (like 4lbs eachish)

He could always try some of them tyres Hamza was running today, eh keef? 🙄

He could if he's a strong lad……….

id doubt you could go 3.7 endo, but ive seen 26 x2.8 DH tires on fat rims in the back of a GF Rig…….

I've got a wtb weirwolf 2.55 lt in the back of my Airbourne ti Hag,on a Stans Olympic !,but f@k me it's tight !

Have a look on MTBR Fat Bike forum.

All sorts of info on there about semi fat conversions.

here you go…