Lightest 18-inch Wheels?

[geetee]

stock? 5 spokes...
aftermarket? too many to list that are light. You'd probably want to list a budget to get a better list as fully forged very light wheels are going to be 6k+. You can also get very light flow formed wheels that are 1.5k range

[j.fro]

Gee tee's questions and comments are spot on. 18x8 under 19lbs and 18x10 under 20lbs is good. Nothing stock in 18 is light.
Measurespeed
If weight is that important, also look at tire weights. Some are really heavy. Gets complicated....

[Luv2Box]

Porsche's 18" "Hollow Core" Turbo Twists used to be their lightest wheel, don't know about now.