Note: The product link has a distinction between options containing BB and options without BB, please pay attention to the distinction when buying, thank you
 

DESIRE-621-TT-1 Road bike crank sprocket description:
CRANK LENGTH:170MM
CHAINRING: 53-39T
BB SETS: PW-BB68
COMPATIBILITY: 10S, 11S
B.C.D.: 130MM
CHAINLINE: 43.5MM
CHAINRING MATERIAL: ALLOY
CHAINRING FINISH: 100% CNC MACH., BLACK SAND ANO. (53T)
CNC DETAIL, BLACK SAND ANO. (39T)
Q-FACTOR / I-FACTOR: 152 / 123MM

OUNCE-621C-TT-N Road bike crank sprocket description:
CRANK LENGTH:170MM
CHAINRING: 50-34T
BB SETS: PW-BB68
COMPATIBILITY: 10S/9S
B.C.D.: 110 MM
CHAINLINE: 43.5MM
CHAINRING MATERIAL: ALLOY
CHAINRING FINISH:CNC DETAIL, BLACK SAND ANO. (50T)
BLACK SAND ANO. (34T)
Q-FACTOR / I-FACTOR: 158 / 129MM

OUNCE-421C-TT-N Road bike crank sprocket description:
CRANK LENGTH:170MM
CHAINRING: 50-34T
BB SETS: PW-BB68
COMPATIBILITY:9S / 8S
B.C.D.: 110 MM
CHAINLINE: 43.5MM
Crank material:ALLOY
CHAINRING MATERIAL: STEEL
Q-FACTOR / I-FACTOR: 158 / 129MM