I've been busy working on a spline drive Bash guard chainring spider recently.
I hope Tree is receptive to this idea. (I had to reverse engineer their 9 keyed spline insert from high resolution pictures on the web)
It adresses the problems encountered when running Profile style 48spline 19mm spindle cranks on a fixed gear bicycle. The traditional single bolt does not hold up to the torques generated in both directions due to cranking and backpedalling.
This also has a giant bash guard on it, for the grinding crowd.
...more to come later =]
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