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If you’ve ever had a true BB30 bike, where the bearings are pressed into the frames without any BB cups, then you know why this matters. Those frames require absolute precision in their molding (for carbon) or machining (metal bikes), but also require a clip to hold the bearings in. And every time you replace the bearings, which is needed far more often than with other BB standards, you end up removing material whether you wanted to or not. That means things move out of alignment, bearings can creak, and drag happens. Here’s how they did it…

They took a standard BB30 6806 bearing, which has a 42mm outside diameter, and reengineered the outer race to have a 40.5mm OD, which lets it fit inside their sleeve. That lets them bring their creak-free, perfectly aligned design to a frame design that’s plagued with reliability and tolerance issues. But it keeps the 30mm inside diameter, so you can still run your BB30 cranks.

The other improvement is the inner sleeve bushing between the bearings. This prevents any preload wave washers or out-of-tolerance frame widths from stressing the bearings.

Retail is $150 for steel ABEC7 bearings, and $205 for ceramic hybrid bearings with lifetime warranty. Available now. They also offer this model with a direct fit for 24mm Shimano, Campy’s UltraTorque and SRAM GXP.

BBinfinite.com

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20 COMMENTS

      • I’d tend to agree with that article they wrote !
        But not they are getting so close with that BB30 version of their BB… BB30 is 42 OD and 30 ID to begin with and is narrow, BB86 is 41 OD and 30 ID (if one wants to use Rotor 3D+, etc.) and is much wider.
        Anyway I think I’m going back to 24mm spindles anyway… you can do everything with 24mm axles and in the end for a same crankset SRAM GXP is probably better than SRAM “30”, Rotor 3D24 is probably better than Rotor 3D+ and Shimano cranksets work great… steel axles are great and no direct contact between crankset axle and steel bearing inner race is often better too (though with anti-seize grease, good alignment, et. it’s possible to prevent that contact from making any noise).

      • I saw that article, too, and it’s got a good point.

        Praxis seem to have cracked it, though. They offer BB86/BB92 bearings for their M30 cranks, which are basically 30 mm spindles stepped down to 28 on the non-drive side, SRAM GXP style.

    • Rotor makes the 4130 BB for 30mm axles to fit into a PF92 frame. Its not one piece though but it seems to hold up well if the frame is properly prepared (faced) and bb fitted correctly

  1. What if every brand of computer had different types of USB ports that weren’t compatible? May all these different bottom bracket variations die a horrible death.

  2. I’m not much for that paper thin outer race. If modifying races, I’d rather go with making the ID 31mm and being able to use SRAM’s top hat plastic bearing shield that protects from metal bearing/metal spindle contact.

  3. and yet again – at the end of the day: what do any of these designs offer over good ‘ol BSA shells? I have options to run any of my cranksets with BSA shells. In the world of pressfit – there are simply fewer options for 30mm cranks that don’t have creaking issues (i.e. have threaded shells or something else to hold the BB more firmly in place than pressed in bearings)

  4. Another approach would be to machine a custom outer race that is wider and extends inward, with fine threads machined, so each bearing could screw together as one, but the bearing size itself is still standard.
    Any takers?

What do you think?