RaceFace Aeffect Crankset - 165mm Direct Mount CINCH RaceFace EXI Spindle Interface BLKRaceFace Aeffect Crankset 165mm Direct Mount CINCH RaceFace EXI Spindle Interface Black. The Race Face Aeffect crank is designed to handle aggressive trail riding at XC crank weight and an attractive pricepoint. Features the CINCH system with its interchangeable spider options and a 24mm EXI interface spindle. Crank arms forged from 6066 aluminum Compatible with all CINCH direct mount rings and spiders to easily convert between existing chainring