Shimano Road BB86 press fit bottom bracket with inner cover, for 86.5 mm: oversize bearing BB for performance road bikes Fits carbon, steel, aluminium & titanium 86.5mm s BB shell frames Oversize external bearings for better power transfer Compatible with Shimano Hollow Tech II road cranks Fibre reinforced polymer construction reduces creaks & scratches Sealed cups keep out grit & moisture Maintenance free Easy press-fit installation