Geoff,
I am not too familiar with the BW cast comp. wheels and FMW counterparts but I DO know for a fact that the weight savings on for example:
- Billet 16G
- Billet 18G
- Billet 20G
- Billet 30R
- Billet 35R
Are almost 30% savings compared to that of their cast comp. wheel counterparts. I can post the weight comparisons if you are interested. Perhaps BW takes a different approach then aftermarket manufacturers like Precision or Blouch for their Billet wheels.
Jasper.