Made in the USA from 6061-T6 aluminum alloy, Cosine chainrings are round and true. They fit 104 BCD four-bolt cranks. Available in black anodized with laser-etched graphics in 38-45-tooth sizes.
38T-BX-CR144B38T: 73 grams/2.25 ounces
39T-BX-CR144B39T: 78 grams/2.75 ounces
40T-BX-CR144B40T: 79 grams/2.8 ounces
41T-BX-CR144B41T: 84 grams/2.9 ounces
42T-BX-CR144B42T: 87 grams/3.1 ounces
43T-BX-CR144B43T: 90 grams/3.17 ounces
44T-BX-CR144B44T: 92 grams/3.2 ounces
45T-BX-CR144B45T: 96 grams/3.36 ounces