I was suprised on this issue.
I used to have freestyle LR Genuine alloys.
Swapped for Mach 5s
Expected the Mach 5s to be far heavier, they were not.....almost the same.
The reason is Mach 5s 8 spokes and Modulars etc can use thinish steel, whereas the alloy wheel has to have a HUGE lump off ally thickness to get the same strength, and although ally is lighter than steel, when you have that much ally there is no weight saving
IMHO, FWIW, STS, TTFN
Nige