The ability to replace components quickly with what a local shop might have, or could be cobbled together from what your friends are riding.
What kind of rides are you going on, where everybody's bikes are self-destructing around you?
It's not a common feature of a ride it is true, but there is a reason that contracts call for replacement parts to be COTS.
@Dammit started
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What kind of rides are you going on, where everybody's bikes are self-destructing around you?