its just a really cheapy one from ebay. the pedals are dead ,the hubs dead and i think the wheel’s going wonky. Theres nothing particularly wrong with the frame although i want to upgrade it to a 24’’.
Go for the frame/wheel idea. If you buy all KH components of course they’ll fit.
You may need to get a new seat post for your new frame depending on the size that yours is, so make sure to check that. Nothing sucks more than getting new pwnage parts and not being able to use them.