Twist lock type matellic axes:This structure can guarantee concentricity and depth of parallelism of two side BB bearing. It also can fix accurately position relation of two side bearing.1. It can bring more stable combination between frameset and BB;2. Filtrate and absorb deficiency of concentricity and depth of parallelism for Bracket Bottom port on both side of the frame set. And it can guarantee that crank run more smooth and transmit riders' output power into chain to the Maximum limit, then convert to drive forward momentum.Plastic steel shell:It is a kind of plastic and steel texture character that allows suitable deformation, but does not damage its rigidity. It also can absorb roundness tolerance for installing ports of Bracket Bottom.1.It can protect Bracket Bottom of the frame to the Maximum limit;2.Filtrate and absorb roundness tolerance deficiency of the Bracket Bottom port. And it can guarantee BB bearing operation in standard roundness tolerance. It also can make BB more smooth, and more longer service life.This bottom bracket is suitable for shimano fsa etc crankset(24mm).Use new design,screw-in type in two side,threaded design eliminates creaking.Dual silicone seal keeps the contamination out for longer life.BB lubrication is similar to ceramic bottom bracket.Tips：1.Before you press the bottom bracket into bike frame,you should coated with oil on bottom bracket and bike frame.2.you should press the left side into frame,then press the right side into it(the right side is plastic cup)3.the last step,screw into the right side of metal part.Product FeaturesMaterial: composite, steelRecommended Use: Road Bike and Mountain BikeShell Width: 86.5-92MMWeight: 100 gManufacturer Warranty: 2 year
