The Shimano Saint M815-1 Crankset is designed for a single chainring and bashguard. The bolt circle diameter is 104/64mm. The crank can be converted to a double. Chainrings available are: 34, 35, 38, 41, and 42t. The chainline is 57.5mm. Any four-arm 104mm bcd bashguard will fit. Shimano recommends their Super Narrow HG 9-speed chain with the chain rings. The crankarms utilize Hollowtech II technology.
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