System-1: both plates attach to and rotate with crank to prevent chain drop. Upper roller prevents chain derailment, lower roller provides chain tension adjustment. ISCG or ISCG-05 mounting options, 4B/104BCD only. ISCG guides can be adapted to standard BB-cup mounting with #MP-430 (sold separately). May require a longer BB spindle for clearance. Features: Requires ISCG mount tabs on frame or an ISCG adapter plate System 1 guides use dual rotating plates that attach directly to the crank’s spider and are incompatible with most standard chainstay frame designs because of interference between the inner plate and World Cup guides have a 36-44t chainring capacity Mini Me guides have a 30-34t chainring capacity

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