29" wheel tyre diameter size?...somebody please explain.

This is probably a daft question but what diameter tyre and inner tube fits onto a 29" rim? (KH 2007)
I’ve tried to get an inner tube from a bike shop and they said just use a 28" one (?) and I’d also like to change my tyre to Schwalbe Racing Ralph 2.4 but can only see listed a 28".

So will a 28" fit? What is a 700 dia?

Somebody please explain to this newbie about wheel and tyre sizes for a 29"…thanks.

This thread should have some answers for you.

Yeah. Mine is a Schwalbe 28 and it was easy to install. I did it with my bare hands and I have pathetic girl hands/strength.