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Description
Rotor has introduced their U4630 to PF30 Threaded Bottom Bracket with steel bearings to alleviate many of the issues that affect other bottom bracket designs. The U4630 is designed to address challenges related to bottom bracket installation and durability. Crafted from 7000 series premium aluminium, the UB4630 uses a threaded sleeve to lock both cups in place. This provides a uniform spin rather than relying on a press fit shell that can cause undesired noises.
The flush fitting in the press fit area also prevents bearing overload by improving alignment. This ultimately leads to a longer bearing life expectancy. The external bearing location affords a smoother spin and increased BB shell stiffness.
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Important Update for Our US Customers
We regret to inform you that due to ongoing challenges related to current US tariffs, shopping on Sigma Sports is temporarily unavailable for customers based in the United States.
We understand how disappointing this may be and sincerely apologize for any inconvenience caused. Please rest assured that we are actively exploring solutions to resume service and find the best way to support our US community.
We appreciate your patience and understanding during this time, and we look forward to welcoming you back as soon as possible.
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— The Sigma Sports Team