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Item # RTR0002

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Item # RTR0002


Leave it to the Spaniards at Rotor to engineer the perfect solution to an oft-imperfect platform. The Press Fit 4630 Bottom Bracket provides a reliable, weatherproof seal for your PF30 shell, and the clever non-contact design delivers the smoothest spin this side of an expensive ceramic bearing upgrade. Over the course of their relationship with Cervelo, Rotor engineers have been lucky enough to have immediate pro rider and mechanic feedback in making improvements on a few small details of the bottom bracket. The seals have been improved, as external bearing bottom brackets of this type have long been known to possess a considerably greater amount of drag compared to some of the benchmark bearing assemblies from earlier generations (think Campagnolo Record square taper). Rotor also thought to improve the plastic caps that snap into the bearings. We often call them dust caps, but they have a structural place in the bottom bracket system, providing a bit of compressive relief in the slip fit between the spindle and the inside diameter of the bearings. But as they also provide a built-in washer between the crankarms and the inner bearing race, too much compression or deformation under load could result in poor bearing preload and lateral misalignment as you pedal. Rotor has eliminated any chance of this and the result is better shifting. The Rotor Press Fit 4630 Bottom Bracket is fitted with Rotor's ultra-smooth steel bearings. The shells are constructed from CNC machined 7075 aluminum. This bottom bracket will fit all PressFit30 frames, and is compatible with cranksets using 30mm spindles. 

  • Improved seals & dust caps
  • Clever non-contact bearing design
  • Steel bearings
  • CNC-machined 7075 aluminum shells

Tech Specs

7075 aluminum

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Avg. ride time: 5h 21m per week
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Will this adapter fit on a Evo 386 frame?...

Will this adapter fit on a Evo 386 frame? I want to install a Rotor cranset on the bike.

That is a great question. I have done some homework on your compatibility question, and you should have no problem with this Bottom bracket working with the following standards BB30 PF, BB386 and BBright. If you have any additional questions, please feel free to email me at