I recently purchased a 47 tooth Atomic Crownwheel from ScootRS and in it's description it is described as "lightened". In the pics you can see the holes drilled in the base and sides.
I got the crownwheel nice and quickly, but one of the first things I noticed was that it seamed a bit heavy.
On weighing both the original SIL crownwheel and the new Atomic ScootRS one my suspisions were confirmed, the new one was a lot heavier!
The SIL original was about 720g from memory while the new one was well over 800g.
After some further lightening it is now down to a touch under 780g.
Begs the question, how light are the other "lightened" crownwheels out there?
Anyone care to contribute their findings?
