Joined: Nov 2004
Posts: 824
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From: parts unknown
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
C and mm are different. Just thought I'd throw that out there.
23's will probably be fine. As long as they fit its really a personal preference issue.
All other things being equal (tire compound, psi, etc) the 23s will probably feel a little faster, skid a little easier, ride a little rougher and be a bit less resistant to pinch flats.