Light weight Racing Flywheel
Since I'm letting some of my other trick bits go
I'll let a few more go (thanks Fay) Light weight Racing Flywheel Weight 5.5# , 6 bolt only. File pic as mine is still sitting at the shop
Will work with all 6 bolt cranks, but you will need a special clutch to run on the street. $450+ shipping. No trades unless you do roofing.