Dura Ace 7400 7s or 8s Cassette & Chain

8 speed cassette will not fit 7 speed hub and vice versa (unless you use a spacer). Easier way to determine if you have 7 or 8 speed is the OLN measurement; 130mm is 8 speed, 126mm 7 speed.
 
The only DA 7 speed cassettes were UG not HG. I have not tried my DA 8 speed cassette to know if its any good. The chain is even more suspect.
 
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