Cane Creek 40 Series Headset Bearing Kit Worn out bearings are a major bummer. We all know this. So if you Cane Creek 40 series headset bearings are wearing out, getting dry, crunchy, or grimy, you should grab a new bearing kit. These cartridge bearings offer the signature Cane Creek smoothness and reliability. Features Size 42mm/52mm 45X45Black oxide bearings sold as pair Compatible headsets Cane Creek 110, 40, and 10 Series | Cane Creek | 40 Series Headset Bearing Kit 42Mm/52Mm 45X45