hmm, i already have a XT m737 wheelset on my Cirrus. so i guess it's already a 11-28T cassette??? now i gotta check.
i also have a XTR M900 rear with an 12-32T cassette on it i believe, and that's on the Blizzard.
i'm going to move the m737 wheelset to the Blizzard, move the XTR M900 for offroad use on the Cirrus cuz it has a beefier M261 rim, and has the 32T, and build up the M910 with matching XTR cassette since it's in very good condition for road use on the Cirrus.