[Espeefan]

Bob, my TLT-1 axle, with a set of standard width semi truck rims mounted on the hexes, measures about 177mm wide. Give or take a couple millimeters. That's total width, including the rims and tires mounted. For the record, the rims I used are the inner rear drivers that come with all the Tamiya semi truck kits. If you would like more dimensions, or photos, let me know. I just took a quick measurement for you, but as far as driven front axles go, the TLT-1 is about the narrowest you'll find for the semis in plastic. In aluminum, there are some nicer axles that can be bought, the same width or even narrower, but you'll pay for it.