Were ARE wheels lighter than stock? If not don't see any reason to have made them. --- (https://i.imgur.com/NESHw91.jpg)
That one is a drum model, So if for a RD350 application that was the newest cool trend look. Also some were in wider rim with for moving up to the next tire sizes. I don't think on some it was about the weight.
Now the TZ Dymags I had on my RD400 modified were really light and super cool with the 3 spoke design.
Chuck
(https://photos.imageevent.com/supertune/earlyrdracingpictures/icons/238racebike2.jpg)
(https://photos.imageevent.com/supertune/earlyrdracingpictures/icons/238racebike4.jpg)
I would love to convert my 75 to ARE. I read they made RD mags but never saw them until that picture...wanna sell that rear or the set?