Whether the frames are identical and whether you can patent angles and dimensions is one
and
I think you probably could if it was an exact copy. There’s more to a bike than angles, tube
IANAL alert… There are generally four ways to protect IP: patents, trademarks, copyrights, and trade secrets.
Although, if you are Specialized, I suppose there is a fifth way to protect your IP: lotsa lawyers.
I doubt that the Sonder or On One designs – a series of frame angles + tube lengths, could be patented, as there is no unique invention and a “design patent” would probably also be similarly difficult to prove uniqueness – I’m sure a quick scour of Alibaba would find many frames with similar enough design features. I guess maybe a case could be made for a trademark, if they were particularly unique, but otherwise it’s just a variation of the double-diamond frame.