Rotor UBB4630 386 BB Steel. You, or more specifically, your choice of frame, motivated us to address challenges related to bottom bracket installation and durability – thank you. We embraced the task to improve upon so-called bottom bracket standards to give you the UBB4630.
Crafted from 7000 series aluminum alloy, the UBB4630 uses a threaded sleeve to lock both cups in place – without having all the locking effort rely on the press fit shell, thus providing a uniform spin and avoiding undesired noises. The flush fitting in the press fit region prevents bearing overload and also improves bearing alignment for a longer bearing life. The external bearing location affords a smoother spin and increased BB shell stiffness for PF30 and BBright standards. The internal sleeve also prevents cable guides from rubbing against rotating parts.
Details
| Weight | 109g |
| Material | 100% CNC-machined, 7075 aluminum. Labyrinth seals prevent bearing contamination |
| Compatible Crankset Brand | ROTOR |
| Material Bearing | Steel |
| Axle diameter compatible | 30mm |
| Frame Type | BB386EVO | BB392EVO |
| Shell Width | 86.5/91.5mm |
| Discipline | Road | Triathlon | Gravel | Cyclocross | MTB |