hyperbolts.com is selling them. Here is the link http://hyperbolts.com/catalog/produc...2bf8eec56987a4
They have a claimed weight of 49g and come in an olive drab finish... I wonder if these will be an alternative to Stans Al rotors.
A cut and paste from the site:
Super light and strong for those looking for an edge
Designed and manufactured in California, USA
Precision laser cut from space age 7075-T6 Aluminum Alloy
Hard anodized with penetration for enhanced surface wear properties
Durable as steel but does not rust
Will fit many systems with international standard ISO 160mm disc braking system by Hope, Avid, Magura, Shimano, etc.
Why pay $40 for steel?
Reduce your rotational weight and increase acceleration
Reduce your un-sprung wheel weight
Provides great stopping power
Portion of the sales will support the USCF/NORBA Team EMC/Documentum
Standard 44mm Bolt Circle Diameter - 6 Bolts
Color: Military olive finish
Weight: 49 grams
Durability: 1 to 2 years with organic/resin pads by Kool Stop only
Use: general XC for riders under 180 lbs. Due to extreme popularity this item is available on a first come first serve basis.
Results 1 to 2 of 2