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.
I'd like to keep the geared setup I'm running but simply switch tyres from my 35c Ribmo to something bigger and more comfortable, now that my commute is mostly off road.
I loved running 2.2s on my ESB in the past so I'd like to push for something slightly larger than the Knards if I can.
I'd like big tyres for my Straggler this summer.
Does anyone know of others who have done big tyres on their Straggler/Cross Check? I want to be sure there's enough space in the rear.