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The largest 3 sprockets on 105 cassettes are fixed together, so in order to have a cassette without any large jumps in tooth size, you'll have to leave off the smallest (11/12T) sprocket.
http://si.shimano.com/pdfs/ev/EV-CS-5800-3715A.pdf
You might need to space the remaining sprocket out in order to put the recommended torque on the cassette lockring.
pifko
Possibly the wrong thread but hopefully someone can advise: looking to put a 11 speed cassette minus a cog, on my 10 speed free hub. Both cassettes are shimano so think it would just be a spacing issue. I've seen online people doing this with the ultegra/DA I was wondering if there should be any issue doing it with a 105 11 speed cassette?