something is not working with your e-mail dood....
anyway, to answer your question, as far as I know no cb750 came stock with an 18" wheel. The cb750A might have but it would be the same front as a 1975 GL1000 which is 1.85x 19".
If the rim is alloy a good way to tell if it is honda is if it is stamped DID since that is where all the 70's big honda alloy wheels came from.
It was not uncommon for people to lace an aftermarket 18" wheel to the front of a cb750, makes the bike handle better and turn in quicker. Gives it a more balanced feel
anyway, to answer your question, as far as I know no cb750 came stock with an 18" wheel. The cb750A might have but it would be the same front as a 1975 GL1000 which is 1.85x 19".
If the rim is alloy a good way to tell if it is honda is if it is stamped DID since that is where all the 70's big honda alloy wheels came from.
It was not uncommon for people to lace an aftermarket 18" wheel to the front of a cb750, makes the bike handle better and turn in quicker. Gives it a more balanced feel