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@gbj_tester
I don't get where the bigger contact patch is adding stability. At the front, the bike is pivoting around the axis of the front hub axle, so having a longer contact patch at the front makes no difference. At the back, the bike is pivoting around the centre of curvature of the tyre cross section, so widening the contact patch, even if it doesn't introduce instability, can only move the pivot up few mm, completely irrelevant when the CG is about 1m above the roll axis.