What Our Gearhead® Experts Are Saying:“This is the go-to EBB if you’re running a singlespeed Niner. It installs clean, holds tension reliably, and stays quiet once dialed. Just confirm your shell spec—55mm diameter and 68mm width—and you’re good to go. A great spare to have on hand if you swap gearing or travel with your bike.”The Niner BioCentric EBB keeps our singlespeed dialed by offering consistent, hassle-free chain tensioning that stays quiet and stable on long miles. Built for frames with 55mm x 68mm EBB shells, it’s a simple, precise upgrade or replacement for riders who prefer the clean efficiency of a geared-down setup. Easy adjustments let us fine-tune tension for different conditions or gearing choices, while the secure interface stays put through hard climbs and rocky washboards. Whether we’re refreshing a well-ridden frame or stocking a spare for the tool bin, the BioCentric II keeps the ride smooth and the drivetrain simple.
Price: $56.25 from Backcountry
| Merchant | Price | |
|---|---|---|
| $56.25 | Visit Store |
"What Our Gearhead® Experts Are Saying: ""Being able to swap between threaded, PF, or BB30 standards on the same frame is huge. I’ve used these inserts on older Niner builds and they’ve always been solid—no creaks, easy installs, and it’s awesome...
"What Our Gearhead® Experts Are Saying: ""Being able to swap between threaded, PF, or BB30 standards on the same frame is huge. I’ve used these inserts on older Niner builds and they’ve always been solid—no creaks, easy installs, and it’s awesome...
"What Our Gearhead® Experts Are Saying: ""Being able to swap between threaded, PF, or BB30 standards on the same frame is huge. I’ve used these inserts on older Niner builds and they’ve always been solid—no creaks, easy installs, and it’s awesome...