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Yes, aluminum like the Eurus has. They are not as bad in the crosswinds as a 40mm wheel. I've had both and prefer the 30-35mm wheels. They are more of an all arounder. The Racing Speed 40 is on the Ultra version while the Racing 0 has the USB bearings...if that makes a difference. I'm not fast enough to take advantage of the speed differences of deep wheels so that is my rational for that. Muffinman has 2 sets of Bora Ultras for sale that look like a good deal. If I didn't have my Racing zeros, I would be buying Ryun's Bora tubulars or Muffinman's Ultra 35's. I haven'y ridden tubulars in over 12 years, but something like a tubular on a nice high end carbon wheel sounds pretty good...fast or not.
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