One of the cooler bits we saw this weekend was the carbon subframe on Chris Howell's bike. There sounds like there might be some question as to whether this one is strictly legal (and there's ongoing discussion with the tech staff on the AMA crew), it's on there for now. Weight savings? About a pound-and-a-half. Stiffer? Yep. More durable? Yes.
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Vital MX Pit Bits: Seattle