Cassette cluster - only largest 3 sprockets?

ChrisSA
ChrisSA Posts: 455
edited June 2011 in Road buying advice
Hello all,

Is it possible to buy the 3-sprocket cassette cluster separately?

I'm running 105 12-27 and am looking to move to 21-25. The only difference is the 3-sprocket cluster at the back - 21, 24, 27 and 21, 23, 25. Seems silly to buy a completely new cassette for the sake of 3 gears...

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