Is a 19 inch bike too big?

I have been told that it is easier to build a slightly-small frame up, than it is to take a slightly large frame down. Things like seat position and handlebars, that is. But to answer your question directly: YES, a 19″ would be too big!

Is an 18 inch bike frame large?

In very general terms, an 18-inch bicycle is best for someone just under six feet in height, but factors like inseam length and the differences between bike manufacturers can all influence the fit.

Is a 19 frame a large?

Generally 19″ is the equivalent of a Large frame, and will fit someone around 6 feet tall.