FSA Duron X Threaded Headset 27.5mm Upper / 13.1mm Lower Stack Height MFPN=100-4006-123 +/-3% accuracy means youll always CheckoutSpec= TyreWiz
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FSA Duron X Threaded Headset 27.5mm Upper 13.1mm Lower Stack Height MFPN=100 4006 123 + 3% accuracy means youll always CheckoutSpec= TyreWiz + 3% accuracy means youll always know your true watts output Quick size chooserBetween sizes FSA Duron X threaded headset