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PhilDAS

Smaller rear triangle stiffer? Or just because reasons?

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Sig_Arlecchino in reply to @PhilDAS

My educated guess would be that they did it for the same reason as on @Breso hour record moser. When you have a narrower BB, you can mount the BB lower (without the risk of pedalstrike) which gives you an aero advantage, I guess. Since the bb spindle is considerably narrower, the chainstays need to be moved up to provide enough clearance for the chainring.

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PhilDAS in reply to @Sig_Arlecchino

That makes a lot of sense, thanks! The chain stay only just passes by the chainring so looks like that would be the case.
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Breso in reply to @Sig_Arlecchino

Looks like the BB shell on the Rossin is a standard one, if narrower, crank arms, spider and chainring would hit the forks/chainstays.

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