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Anthony_marr · June 23rd, 2009, 08:15 PM

I have a 15-teeth front sprocket. I did ask the Kawi mechanic why people change the front and not the back. He told me that if you change the rear sprocket, you will likely need a new chain, because you current chain will probably be too long or too short depending on whether you increase or reduce the number of teeth. It is not necessary to change both unless you want to radically change the gear ratios. There is no reason why both MUST be changed. - AM

June 23rd, 2009, 08:15 PM	#6
Anthony_marr ninjette.org guru Name: Anthony Location: Vancouver, BC, Canada Join Date: Dec 2008 Motorcycle(s): 2005 Kawasaki Ninja ZZR 250; 1996 Suzuki Katana GSXF 600; 80s Yamaha 650 Special; 70s Kawasaki 350 Triple Posts: 448	I have a 15-teeth front sprocket. I did ask the Kawi mechanic why people change the front and not the back. He told me that if you change the rear sprocket, you will likely need a new chain, because you current chain will probably be too long or too short depending on whether you increase or reduce the number of teeth. It is not necessary to change both unless you want to radically change the gear ratios. There is no reason why both MUST be changed. - AM