Anyone know which biocentric is needed for the new SIR, and where I can get one?-
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  1. #1
    mtbr member
    Join Date
    Apr 2008

    Anyone know which biocentric is needed for the new SIR, and where I can get one?

    I thought it was the Biocentric 30, but on the only place I found it supposedly in stock, they say Air9 and RLT9 ONLY. So, not sure if I am right or not. Looking at buying an SIR, but only if I get get the part to make it an SS.

  2. #2
    mtbr member
    Reputation: RacerLex's Avatar
    Join Date
    Jan 2010
    You need the Niner Biocentric 30. They have been in limited supply for many months, probably in part to supply chain interruptions. Niner has made a few eccentric bottom brackets but only one for PF30 frames. So if it fits the Air and RLT, it will also fit the SIR (current generation).

    This is the part you need:

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