Check the listing for details. PF4130 (BB8630) Bottom Bracket with AITA Ceramic Bearing. Condition: New. Listed at 173.95 USD. PF4130 (BB8630) Ceramic Bottom Bracket for 30mm Spindle Cranks Tested for 5 years by Jason Christie, former 2 x New Zealand National Champion."Don't let the lesser-known brand fools you. AITA ceramic bearings have been a grame-changer for me. Whether it's their bottom brackets or wheel bearings, I've been blown away by the performance and durability. My bike never felt faster!" – Jason Christie 2 x New Zealand National Champion About the brand AITA Ceramic, also known as Australia International Ceramic, a Melbourne-based company with vast expertise in designing and producing top-notch ceramic bearings.Since 2015, AITA has proudly sponsored Australian Paralympians. We were thrilled to see them win two gold and one bronze medal at the Tokyo 2020 Paralympic Games. Product Features: CNC aluminium BB cups;ABEC7 high chrome vacuum degassed bearing steel races with quenching and tempering hardening;Grade 3 Si3N4 ceramic bearing balls;Nylon bearing retainer;Dual lips light contact rubber bearing seals; Frame requirements: PF86 standard frame; Shell inner diameter 41mm and width 86.5mm. Crank compatibility: 30mm spindle cranks.