Feature: 104mm BCD. Wide tooth alternate with narrow tooth for low chain falling possibility. Suitable for most crank arms like SHIMANO. For mountain bike and AM/XC refitting single chainring. Ultra light and b by aluminum alloy forged. Specification: Material: Aluminum alloy Color: Black Model: 32T / 36T (optional) Shape: Round / Oval (optional) BCD: 104mm Thickness: 4mm Weight: 40-57g / 1.4-2.0oz Package list: 1 * Bike Chainring