On some bicycles there is only one gear and therefore the gear ratio is fixed but most modern bicycles have multiple gears and thus multiple gear ratios a shifting mechanism allows selection of the.
													
																	Multi speed bike chain. 
									
	
		
	
																	A geared bike with a derailleur already has a built in tensioner purchase a pair and follow the instructions on the package. 
																	Multi speed chain. 
																	If you can you might like to purchase a tool called a chain tensioner. 
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																	This tool is useful for bikes that have a derailleur hanger or for multi speed bikes that have been converted to single speed. 
																	There are rear hubs with multiple internally geared speeds but the chain is still commonly called a one speed chain. 
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																	They are also referred to as eighth inch chain the 1 8 chain will measure approximately 9mm across the rivet. 
															
													
									
	
		
	
																	The one speed chains are not designed shift on the multiple rear cog sets of derailleur bikes. 
																	Whether you have a road bike a mountain bike a recreational bike or a street bike this is the easiest chain to get start and to grow with. 
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																	Kmc k710 kool bicycle chain 1 speed 1 2 x 1 8 inch 112l silver black by kmca0. 
															
													
									
	
		
	
																	Mini chain tool. 
																	Oumers bike link plier chain breaker splitter 6 pairs bicycle missing link chain plier quick link opener remover plier for 6 7 8 9 10 speed chains repair professional bike chain repair tool kit 4 6 out of 5 stars 329. 
																	Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence the rate at which the rider pedals and the rate at which the drive wheel turns.