The B button. It's not even remotely hard to figure out.
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Unfortunately, you can't change gears on bikes in HeartGold.
there is no acro bike on Pokemon platinum, you press B to change gears
To change gears on the bike, all you have to do (while riding it) is press the B button. You don't have to hold it in, either. ~Lucario
press b
you can't it only goes up to gear two. To switch gears press the B button.