Old, SLOW bike rider! ;)
Join Date: Nov 2008
Location: Colorado Springs, CO.
Bikes: 1993 Mongoose Switchback MTB
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Haven't done this with a Sirrus but I went from 32's to 25's on my 2011 Jamis Allegro 1, after a couple of hundred miles, I think I'll put on 28's as the ride with 25's is a bit harsh. Now it's got a lowly cro-mo fork, not a carbon fiber unit so that may cause some of it, ie: the 25's get a bit squiggly on even hardpacked dirt, jmho, ymmv.
Take care, RIDE SAFE, have FUN!
1993 Mongoose Switchback Ridged MTB, converted to a "Rail Trail Bike"! :)