J jack New member Jan 16, 2010 #1 down to a 20 t or a 22t? how do i know how big my back cog needs to be and what chain i need to buy? and how to i work out the gear?
down to a 20 t or a 22t? how do i know how big my back cog needs to be and what chain i need to buy? and how to i work out the gear?
B Bob A New member Jan 16, 2010 #2 If you want to keep the same gear ratio do a little math. 34 / 16= 2.125 22 / 2.125= 10.35 use 10 20 / 2.125= 9.4 use 9
If you want to keep the same gear ratio do a little math. 34 / 16= 2.125 22 / 2.125= 10.35 use 10 20 / 2.125= 9.4 use 9
