zestaw suportu bmx primo mid bb set ridehubThe Primo MID BB Set is a complete BMX bottom bracket kit designed for maximum durability and smooth crankset operation . Thanks to sealed cartridge bearings , the bottom bracket provides minimal friction and high resistance to dust and dirt , making it an ideal choice for street, park, and dirt riders. The kit fits frames with a mid mount bottom bracket , and includes spacers that allow for precise adjustment to various configurations. High quality