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.