Box two chaining

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Made in the US from 6061-T6 aluminum alloy, Box Two™ Chainrings are round and true. They fit 104 BCD four-bolt cranks and are available in black anodized with laser-etched graphics from 38 to 45-teeth. 104 BCD Compatible3/32" Chain CompatibleAnodized AluminumOptimized For StiffnessLightweight Cutouts BCD 104mmMaterial 6061-T6 AluminumOrigin Made in USAThickness 3.5mm38 Tooth 73 grams / 2.57 ounces39 Tooth 78 grams / 2.75 ounces40 Tooth 79 grams / 2.78 ounces41 Tooth 84 grams / 2.96 ounces42 Tooth 87 grams / 3.07 ounces43 Tooth 90 grams / 3.17 ounces44 Tooth 92 grams / 3.25 ounces Show more