SHIMANO FC-2450 50/34T Double 8-Speed Claris Crankset Review Posted by GiantPandaisy May 25, 2018 in Drivetrain Components Uses Octalink bottom bracket with recommended length being 113mm for doubles Alloy arms with steel rings Without chainguard Shimano’s Claris crankset features smooth shifting, great looks, and affordability to the 8 speed road/touring class. Cycling Outdoor Recreation Parts & Components SHIMANO Sports & Outdoors