I have these on my bikes. http://www.pricepoint.com/Brand/Prof...FQmCfgodIU0A1w .They're cheap, but they work. I had one shatter when I dropped the bike and it impacted on something hard. I replaced it with another just like it, and just try not to drop the bike. They could make them from a glass filled polycarbonate and it would make them a lot more impact resistant, and only add a buck to the cost. Carbon Fiber is over kill, and would work better for me at lightening my wallet, than lightening the bike.