Currently they use magnesium alloys which are very similar in weight to CF-only about 20-30% more if i'm guessing right(from info on GP bike wheels i've picked up over the years)
Interestingly honda used CF wheels on their GP bikes but changed back to Magnesium alloy sometime in the early nineties i believe.The CF ones were abit lighter but only lasted half as long and were much more expensive.
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