AITA BB8630 (PF4130) ceramic bottom bracket provides the opportunity using EVO386 30mm spindle cranks on a BB86 41mm ID frame. In order to support a large 30mm spindle crank into a 41mm ID BB86 frame, we have applied 4 customized ceramic bearings in the bottom bracket. Compared with the other's 2 bearing system, the 4 bearing system could distribute the power evenly within the bottom bracket, which reduces the wear on the bearings and ensures the full performance after the conversion.
As same as the other AITA ceramic bottom brackets, this BB8630 (PF4130) ceramic bottom bracket is an integrated unit that requires no adapter or spacers.
With the grade 3 Si3N4 ceramic balls (8 times rounder and 4 times smoother than the steel's), spinning on the hardened ABEC 7 races, this ceramic bottom bracket only consumes 21% of the power compared with a Shimano Press Fit bottom bracket in average, plus the bearings will last 3-5 times longer.
2 year warranty.
Free shipping worldwide.
CNC aluminium external 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;
Press fit BB86 standard frame;
Shell inner diameter 41mm and width 86.5mm;
EVO386 30mm spindle cranksets.