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One23 External Ceramic bottom bracket



High quality bearings and good longevity make this one to consider next time your external bottom bracket packs up

Bottom brackets aren't that exciting. The ONE23 external ceramic bottom bracket is a good one though. It's lasted very well, it's buttery smooth and not too pricey.

We've tested the more expensive version of this bottom bracket in the past, which has a carbon internal sleeve. Personally, I think if you think you need a carbon sleeve for your bottom bracket then you're beyond help. This one has a plastic sleeve, which does the same job at the same weight for a fraction of the cost. The bearing cups aren't machined to the same extent so they're a bit heavier, but the important bit – the bearings – are the same as the top end one.

And they're very good bearings. There's no play and much less friction than you'll find in a standard Shimano Hollowtech 2 bottom bracket. Stick the cranks on and give them a shove and they spin for ages. More importantly that's still true nine months and several thousand kilometres, in all weathers, later. My main bugbear with external bottom brackets is that they don't last as well as cartridge ones did (and still do). This one is lasting pretty well.

Does that ceramicy goodness actually make any difference to your performance? I'm guessing not. The tiny amount of drag from a bottom bracket isn't going to register in the big going-forward equation. But it's well-made and built to last, so hurrah for that.


High quality bearings and good longevity make this one to consider next time your external bottom bracket packs up.

If you're thinking of buying this product using a cashback deal why not use the Top Cashback page and get some top cashback while helping to support your favourite independent cycling website test report

Make and model: One23 B/B EXTERNAL CERAMIC BEARING 68MM ROAD - Alloy

Size tested: n/a

Tell us some more about the technical aspects of the product?

Ceramic Bearing Bottom Bracket

68mm Road specific

Alloy Centre/Red anodised cup

Shimano Compatible

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight, if applicable:
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

Very well

Tell us what you particularly liked about the product

Super smooth and druable

Tell us what you particularly disliked about the product

I wish it had a carbon inner sleeve. I'm joking.

Did you enjoy using the product? Yes, inasmuch as you can enjoy using a bottom bracket.

Would you consider buying the product? Yes.

Would you recommend the product to a friend? Yes.

Overall rating: 8/10

About the tester

Age: 40  Height: 190cm  Weight: 102kg

I usually ride: whatever I'm testing...  My best bike is: Genesis Equilibrium with SRAM Apex

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: commuting, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track


Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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