Oh noes! I just checked the packaging and it reads 1/2 X 1/8"!!! Crikeys! I hope I didn't damage the gears. I've been riding it for the past 2 days including a >35km trek home yesterday! Seems to spin fine. It did rattle abit with the FD cage. Should I switch it out for a 3/32?
1/8 chain would not work with a 7 speed so you probably grabbed the right chain... some very old derailer and freewheel combinations can handle 1/8 chain.
Does that mean I have an old derailer? The bike's only 3 yrs old!