Origin8(Formerly Bulletproof) BMX cranks can be used as a single or double chainring setup. These use the highly versatile 110 mm bolt circle, and fit standard tapered-square bottom bracket axles. Chainline w/107 mm bottom bracket: 43.4 mm as double (middle of spider) 47.1 mm outer ring 39.7 mm inner ring 158 mm tread ("Q factor") 530 grams (165 mm) Arms only, no bolts nor chainrings included. Lengths available: 165 mm and 170 mm
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