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Ofph, fired mechanic? Was it even bolted on?
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Reportedly it was because they used x1 chain ring bolts instead of x2 chain ring bolts... So literally one thread engaged?
https://escapecollective.cc/explained-costas-chainring-calamity-and-romandie-recon-puncture-chaos/
Kurai
@ketsbaia
Blimey, Rui Costa just sheared the crank arm off his chainset at the start of the Tour de Romandie prologue.