To make the gearing taller on your Hero Xtreme 200R, you would generally want to increase the number of teeth on the rear sprocket or decrease the number of teeth on the front sprocket. This would result in a higher gear ratio, allowing for higher speeds but potentially sacrificing acceleration.
Altering the gearing can affect the engine's power delivery, acceleration, and overall performance. It may also impact the bike's warranty, so it's advisable to consult with a professional mechanic or authorized service center before making any modifications.
If you still wish to pursue changing the sprockets, you can consider visiting a reputable motorcycle parts retailer or contacting Hero directly to inquire about available sprocket options for your specific bike model. They will be able to provide you with information on compatible sprocket sizes that can help achieve your desired taller gearing.