Samox TAM38 Fat Bike Crankset - 170mm crank arm length, 11-Speed, 30t, Direct Mount chainring, 24mm Spindle (fits Shimano Hollowtech bottom brackets). This crank is for Fat Tire bikes with 120mm bottom bracket shells. Brand new, never ridden, never installed. This is a quality unit that many big name bike brands use on their builds. It's listed as 11 speed compatible but you should have no problems using it with 8 or 9 speed groupsets as well. I got stuck with this crankset. The bike I was building has a 100mm bottom bracket shell so this wouldn't fit as it is for bikes with a 120mm shell. The overall length of the spindle is 175mm. Please be sure about what you need before purchasing! Any questions, please reach out. I should be able to help after the hassle I just went thorough!