i oso jus change recently ..
i havent even notice the chain loose liao ... beside giv me weird
loud sound..
after changing ..
the shop recommand me $170 for chain and sproket,
after changing, i notice the chain and sproket was smaller,
i now fear that it will break up one day, but i notice smaller
chain and spocket will result in low rpm,
my sp in stock condidtion, was rpm 7 at 120km/h
but now the rpm was 6.8 at 120km/h,
does that means my bike can go 4 higher top?
btw wat type of chain lub is good ?
no $$$ to chain liao .. must matin the chain and sproket well this
time .. 
Advise Needed!!! thx..