BB30A83 Custom Bottom Bracket Designed and Manufactured – Cannondale Topstone

Posted on 4 Comments
Cannondale BB30A83 Shimano Bottom Bracket

A Hambini viewer recently enquired about a bottom bracket for his Cannondale TopStone Gravel bike. This bike uses a BB30A83 bottom bracket. A design which is highly unusual, extremely rare and unique to Cannondale.

From the frame centerline, the driveside and non drive side apertures have an asymmetrical offset – hence the “A” in BB30A83. There is not much room to work with on the non drive side. Additionally, the user requested a necked design to give him clearance for his internal cables.

The final design is shown below

If you need of something that is not readily available from elsewhere, then please do get in touch.

4 thoughts on “BB30A83 Custom Bottom Bracket Designed and Manufactured – Cannondale Topstone

  1. Wow, Very impressive. I just had to engineer a water tight seal! Please can you confirm the BB is for a 30mm spindle ? And price?

    1. It’s not possible to make any bearing water tight. You can make it water resistant but submersion will result in ingress. This bottom bracket was for a Shimano crank.

  2. Interesting. I’d like to fit a Campagnolo Ekar crankset to the Cannondale Topstone – I wonder if something similar to this might be a solution?

    1. It’s not straightforward fitting a campag crankset into that frame. The bearing arrangement is fixed floating, so the interference is actually on the shaft. It can be done but it isn’t easy.

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