Thank you all for replying... So if I have handlebars that are 8.3cm/3.25 inches in the centre. What size bars are these 25.4, 26, 38.1, when looking for the right stem to properly fit it ?

Secondly what is the other end of the stem sizing - is it a 1-1/8" stem or 1", if the one already on it is roughly 7cm/2.8" in circumference ?

I am thinking, that i should be looking for a stem that is ( 1-1/8" by 26 ) - is that right ?