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I originally thought this was design flaw with having nuts on thin single outer-layer of frame. Stronger design have threaded tube span width between outer to inner layer of frame (double-shear). However, after seeing couple of wrecks at track with bikes that had strong rearset mounting, hard crash will actually bend frame instead of breaking off those nuts. And next closest spot on frame is swingarm pivot, which was tweaked and distorted by having rearset mounting bend both layers of frame. Ended up costing over $600 to have frame professionally repaired and aligned.
What you can do is drill through to back side of frame and use thin nuts on other side to hold rearsets.
1. remove mounting bolts and broken frame pieces from rearsets
2. line up rearsets in correct position on frame and use pencil/marker through mounting-holes to mark spot on back side of frame
3. remove rearset and drill 8mm hole on back layer of frame (go slowly and don't hit chain or swingarm when it pokes through).
4. get longer mounting bolts for rear-set that sticks out back side 5mm (measure length needed)
5. get thin 5mm thick nuts, or grind regular nuts thinner
6. use blue Loctite and mount rearsets back on with longer bolts and nuts on back side.
Had to do this to teammate's bike after crash at Buttonwillow. Got it up and running before her next race. This is also why I only use folding-pegs on my bike.
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