We have 2 types of ultralight carbon mountain bike rims to release, widths in 27mm and 30mm. The profile drawings are as below:
29" 27mm rim model is NXT29UL27, weight is only 280g.
29" 30mm rim model is NXT29UL30, weight is 310g.
27mm is symmetric, 30mm rim is asymmetric.
We use 30% T1000 carbon fiber + 70% T700 carbon fiber materials to manufacture these ultralight mtb rims, specially design the layer-up system.
T1000 is a very expensive materials, it's usually used in military project. The stiffness/rigidity is much higher than T700 or T800, and very light. While, relatively the tenacity is not as good as T700.
So we choose T700 + T1000 carbon fiber to manufacture the ultralight rims. Plus, the spoke holes wall is designed with single point reinforced, good to decrease weight while keeping the strength enough.
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