I'm in the final stretch before leaving for Ashland to teach and this is frame # 2 in a small batch of scandium frames that I hope to send to the heat treater before I leave. I'm also doing a couple more steel frames as well.....full schedule. This bike is designed to be really stiff in the BB area. I used an MTB downtube 44 mm in diameter. It may be large but it is still really light. I would be surprised if this frame is over 3 lbs. I used some heavy wall chainstays as well, the same kind I use in cyclocross bikes. The rest of the tubing is pretty much the norm for this style of frame.