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NinerEBB Bio-Centric V2


Item # NNR0034

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  • Black, One Size ($89.00)
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Item # NNR0034

EBB Bio-Centric V2

Since their inception, we've had a love-hate relationship with eccentric bottom brackets. They offer some serious advantages over sliding dropouts, but have their own set of design flaws to overcome. Traditional eccentric bottom brackets use set screws or an expanding wedge to hold the eccentric in place. The set screws can strip out and mar the eccentric, making adjustments difficult as it ages. The expanding wedge eventually ovalizes the bottom bracket shell, again, making adjustments difficult. Niner has overcome this problem with the EBB Bio-Centric V2.

An essential design element of the Bio-Centric system is that the cups lock to the bottom bracket shell’s flange. Once the EBB is in position, one bolt tightens the two eccentric pieces against the flanges, providing 360 degrees of purchase while eliminating any chance for creak-causing dirt or debris to contaminate the interface. Also, the shell won’t ovalize or suffer from the over-tightening issues of traditional EBB designs. This simple solution makes your Niner the true Zen-machine SS bikes should be. The wheel can be removed without readjusting caliper position or chain tension, and you’re guaranteed perfect dropout-to-frame alignment, unlike individually adjustable sliding drops. This means your brakes are always perfectly aligned and your rear wheel will never slide out of place and rub on your stays.

The Bio-Centric V2 offsets the bottom bracket spindle 8.5mm from center, which offers a greater range of adjustment than most eccentric bottom bracket setups. This allows you to use a greater range of gears and makes changes to your frame geometry via the bottom bracket more noticeable.

The Niner EBB Bio-Centric V2 comes in Black and is compatible with all Niner EBB frames.

  • An eccentric bottom bracket for running your Niner as a singlespeed
  • Increased offset allows for a wider range of adjustments
  • Two bolt design distributes clamping force over a wider area
  • Allows a clean singlespeed setup, no need for adjustable dropouts
  • No need for bolt-on hubs or chain tensioners
  • Eliminates the need for brake adjustment after gear changes
  • Only fits frames with BB shell dimensions of 55mm diameter and 68mm width

Tech Specs
Shell TypeNiner Eccentric EBB
Shell Width68mm
Recommended Usemaintenance
Manufacturer Warranty5 years

Actual Weight

Black, One Size

Actual weights are measured in-house by the Competitive Cyclist team.

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What do you think about this product?



I want a new Sram crankset.( i purchased the descendant carbon) I am upgrading to the niner biocentric v2 for my SS. which TRUVATIV (powered by Sram) works for my SS with this biocentric BB( item # NNR0034)


Will this work with the RLT?


Hey, would this fit in a Niner BSB9 frame?

No, This will not work with carbon frames. Alloy frames only

It works with One 9 rdo carbon. Comes with the frame.

Just got off the phone with Niner. They said no, not on the BSB