A friend of mine just gave him an older road bike of his. It hasn't been ridden is a long while so i began to tighten and adjust most of everything. As i got to the test ride, i heard some clanking in the back, i look at the back closer and saw that the 4 biggest cogs on my cassette (i hope thats correct terminology) were able to spin slightly while i held the lower 4, or if the chain was on the lower 4. When the chain is on one of upper 4, the lower 4 cogs can turn, but very slightly.
The spin isn't a huge spin, its a tiny wiggle, but i have never seen this before and i just wanted to make sure it was ok.