Generally when you enlarge one gear you have to shrink the other one. I think you may have your gear combinations wrong.
So it might be 18/42 and 16/46. The 18/42 will give you higher gearing which if you have enough power will give you more top speed. The 16/46 will give you more low end torque but you might find you run out of revs. Generally when going with a bbk the taller gears benefit you more.
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