This could be solved easily at RAGBRAI. (As if a "solution" was needed).

Find 100 cyclists on steel.
Find 100 cyclists on aluminum.
Find 100 cyclists on carbon.
Let's leave titanium out of this.

At the halfway mark, each bike will have a cinder block dropped from 4' above it, directly onto the TT. Participants must ride the bike, damaged or not, to the finish.

Or skip the whole mess and just ride bikes.