e.13 guides offer a straightforward installation process and reliable designThat makesThemTodays popular choice.The DRS (dual ring security) replaces your outer chainring with a bashguard and allowsThe use ofTheTwo inner chainrings. Fits frames with ISCGTabs, or can be mounted underThe right-side Bottom Bracket cup for some applications Fits 4 bolt, 104mm BCD crankarms Covers a 32-36T middle position chainring
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