What's the difference between the 760 and 770 cassettes ?
^ +1. 760 has a steel lockring VS aluminum on the 770.Two differences I noticed when putting on a 770 compared to my last few 760s. 770 has a slightly different lockring (a little lighter I think) and also has small studs on the spider pointing in towards the spokes (I think this is to catch the chain and save the spokes from being shredded if the chain goes off the top of the cassette and you don't have a plastic protector installed between the wheel and the cassette).
Better not be this one then lol.no, it was a new in pack auction with free shipping for $60, maybe not a great deal but a good one