Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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Alivio is one step down from Deore, so there should't be too much difference in the weight or quality of them.
The biggest difference is the Bottom Bracket type.
Alivio, dependant on model, are for either Square Taper or Octalink BB systems, Deore (M951) is the Hollowtech 2 (HT2) system.
The advantage of the HT2, is increased stiffness (this is noticeable), and ease of fitting, although it does need to have a well finished BB shell.
Is it worth it? Do you already have a Bottom Bracket? if not, the Deore comes (retail packaging) with a BB, the Alivio doesn't, also, you don't need to worry about the BB spindle length for the Deore, you will need to measure for the Alivio, but the Deore is a fixed length (73mm) regardless of the frame, using spacers to get to the correct size.