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Looks like Dymag is only making these in 18", 19" and 20" so far. Of course, the 18" is only 13.2 pounds, which is amazing. Makes me wonder what a 15" carbon-fiber/magnesium wheel would weigh (and cost).
$8700 actually sounds about right. The Marchesini rims for my motorcycle are about $2500 for the pair, and they're just magnesium (no carbon fiber). Plus the bike rims are only 17" X 3.5" and 17" X 5.5".
... whisk broom and dustpan hanging on the wall behind the car so that the owner can quickly sweep up the CF shards from the garage floor after curbing the wheels on the way home from the pub.
The wheels are actually very strong... I saw a pic (stress test i think) where the center broke out and the CF looked flawless. They had an aluminum rim next to it broke in half.
Kechan, probably similar to what they do with CF/Alum MTN bikes... embed a "dovetail" type joint. The CF epoxy eats away he aluminum tho, magnesium... I have no idea.