Just installed a 2.4” Bontrager XR3 on my front wheel.
My rim has an internal width of 23mm, and the tire installed comes out to about 2.15” width. That is surprisingly narrower than the 2.2” XR2 on the back wheel, which measures out to 2.25” installed. Did not get a weight on it.
The XR3 seems narrower in the sidewall, whereas the XR2 seems to “bulge out” on the sidewall (looks rounder, I suppose). The treads look about the same width.