Shimano HG50 9sp to HG80 9sp cassette

[I am Spartacus]

Want to swap out the HG50 to the HG80... should be a straight swap and no problems .. am I correct?
REASON: Need closer ratios and weight save

 

[spandex]

It will work just fine.

 

[I am Spartacus]

It will work just fine.

cool!
the cassette I'm sure ..... me that I am uncertain of

all this because someone mentioned... why not go racing...? grrrrr

 

[e-rider]

will be no problem if the gear ratios are the same or very similar