I could see a highly optimized single-piece dead-axle 4" wheel approch .10 lbs. Our 4" 2 piece 7075 bead-lok style wheel weighs .23 lbs. No reason a less complicated and more optimized wheel utilizing a material with another 30ksi of yield strength couldn't cut that weight in half...

__________________
-Travis Covington
2008-2017 - Engineering Mentor of
Team 254
2001-2008 - Engineering Mentor of
Team 968
1998-2001 - Mechanical Director/Driver/Member of
Team 115