Cassette or freewheel??

[weely]

Can anyone tell me if my 7speed 'Shimano Hyperglide' is a cassette or a screw on freewheel?

Iv had conflicting advice from two LBS's

 

[marinyork]

IIRC the hyperglide bit is irrelevent, that's just the name. It could be either. However as I was in the same spot a few months ago I think there's about 75% chance it's a freewheel as mine is.

If it looks like http://www.sheldonbrown.com/free-k7/pages/frwl-shimano.html then it's a freewheel like mine .