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Remember also that bikes like to (in fact they're designed to) follow camber. A groove in the road presents as a radical camber change, and depending on which wheel hits it first you could get a short moment of imbalance between the front and rear (front wanting to go one way and rear wanting to go another), which then take a few moments to "settle" once both wheels are back on even camber.
There's also a leverage effect with such a wide rear wheel: when you hit some steep camber, the "force of the road" is pushing up through a point on the rear wheel that is NOT in the centre. It's off to the "up hill" side. This has the effect of tipping the bike down hill a little, and the front typically follows a little later due to rake/trail effects.
Again, the bike is designed to behave this way, and will always correct itself if you let it. Grabbing on tight to the bars reduces the bike's ability to sort itself out.
Rob
There's also a leverage effect with such a wide rear wheel: when you hit some steep camber, the "force of the road" is pushing up through a point on the rear wheel that is NOT in the centre. It's off to the "up hill" side. This has the effect of tipping the bike down hill a little, and the front typically follows a little later due to rake/trail effects.
Again, the bike is designed to behave this way, and will always correct itself if you let it. Grabbing on tight to the bars reduces the bike's ability to sort itself out.
Rob