Riders with the new PF4130 design can use this kit to service their bottom bracket. It is important to note that the inner race must be recessed roughly 2.8mm to provide clearance for the dust cover. this is the key change on the new PF4130 that began shipping in 2018. if the inner race (and seal) are flush with the outer race, please contact us directly for support. Crank Compatibility: 30mm spindle Frame/cup: BB86/BB92 In the box: 2 bearing seals 2 bearing dust covers 1 x O-ring 2 x 1mm spacers 2 x 0,5mm spacers 5ml CeramicSpeed All Round Grease The Story CeramicSpeed is one of the world’s leading suppliers of ceramic bearings. The company consists of two specialised sales channels, focusing on cycling and industrial applications. We have more than 15 years of experience in bearings applications, and we have developed close relationships with our component suppliers over the time – each of whom is the very best in their fields. The CeramicSpeed Sports channel delivers both bearings as well as ultrafast racing chains, reinforcing the company’s goal of saving watts and delivering the lowest friction available. All our bearings are handmade and our chains are optimised by hand in Denmark.