The Race Face Aeffect EXI Crankset pairs the forged aluminum crank arms with a steel Cinch direct mount chainring already sized to fit, so there's no separate ring to track down before a bike comes together. The Cinch interface stays the same if a rider ever wants to swap tooth counts down the line, meaning this crankset isn't a one-size decision locked in at purchase. What Our Gearhead(R) Experts Are Saying:"I bought the arms and ring together for a customer's budget build, and swapping to a smaller ring six months later took ten minutes with no new arms needed."