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The rims are these: http://www.superstarcomponents.com/en/pluswide26-clearance-pair-of-rims.htm
and the tyres are 2.3's. I have about a cm of space around them front and back. I tried some 1.5 slicks on as well, and they fit the rims OK but looked tiny so I took them off.
The tyres measure exactly 2.3 - the rims haven't made them wider, just the sidewalls straighter I think.
Not sure if this pic shows the clearance any better.
This is my monsterish tourer/utility kona, mostly used for hauling shopping and a toddler at the moment on a seat mounted on that extra tube (the other extra tube).
Just got new fattish rims (44mm ext) that are super plush.