I don't know what the 140 comes with now, but mine has a 2 groove roller like this one. http://store.cyberweld.com/hodrro0vsmso.html

I use .023-.025 wire all the time. The tips have enough wiggle room that .023 to .025 wire will work. Hobart lists a separate liner for .023-.025 and .030 wire. I use the same liner for everything