I bought a 7 speed chain
I'd never heard of a 7 speed chain. I've always used 8 speed. The difference seems to be that the 7 speed only works with Uniglide and the 8 speed swings both ways. It was half the price of the 8 speeds, and all but one of my bikes are uniglide, atm. I will shortly install it and see how it works.