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Bet you never got along with the front bit ..
25c maybe depending on tyre on narrow rim .. I have 25c michelin pro4 under mine (Canyon Ultimate AL) but don't think I'll ride them; will swap to 23mm.
Some day I'd like to replace the Canyon with something like Cervelo R2 or Felt F1PR for a serious road bike that can take mudguard purpose. Hopefully all this disc brake malarky will make luddite rim brake stuff cheaper soon.
Can i fit 25c under them?
EDIT: Anything mroe walled friendly?
I used these before on another bike http://www.wiggle.co.uk/sks-raceblade-long-2-mudguard-set/