Larger diameter = increased centrifugal force = more resistance to changes in direction. This is why sport bikes have 17" front and rear wheels with low profile wide tires. Great for handling and corners compared to the tall skinny wheels and tires of dual sports and cruisers.
That said, ad the rest have pointed out the chassis setup and overall geometry of the bike play a big role. Too. Lowering the back of my Hawk increased the rake and trail a decent amount, which lead to a much more stable and lazier steering bike. It loves to cruise along at highway speeds. When I had the.other shock on and the back of the bike sat higher than stock it was much more twitchy at high speeds. Same tires with both setups.
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