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2.0" on the front, 1.75 Smart Sam on the back below... apparently clearance is tights at the back, possibly slammed back in the dropouts.
CTBM says Smart Sam is the biggest for Cross Check too... http://www.charliethebikemonger.com/schwalbe-smart-sam-700c-x-47mm---28-x-175---the-biggest-tyres-to-fit-a-surly-cross-check-2158-p.asp
How big do you want to go? I've got Knards in at the moment and they're pretty sweet on and off road. There's stacks of clearance at the back with the wheel in geared position, even more if you were to go singlespeed.