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					Originally Posted by  Tony Wheeler
					 
				 
				Perhaps there were slight variations to adjust rpm for particular applications, eg. the Lynx on 12V may have run a slightly smaller pulley diameter (ie. effective pulley diameter) to operate at slightly higher rpm. 
			
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 A smaller pulley will spin faster, meaning it will put out a charging voltage at lower rpm. If you plan on routinely running at higher rpm, a larger pulley will be a better choice.