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I don't think you can sqeeze 1.75 tyres onto 700c rims?
But can you go down to say 35/42mm CX tyres on dedicated 29er rims?
I used a 2.1 Schwalbe Albert on an open pro rim (made for a round profile but no major concerns) so 1.75's should be fine.
Can't see there would be much problem running my Houfalise CX tyres (32c?) on the DT 29er rim either - though I have not tried that way round.
I've managed to fit 2.4 inch big apples onto some touring bike rims. I think the minimum they will accept is a 28mm tyre.
i have got bontrager 1.8 29er tyres onto my shimano r550 road wheels. They dont roll too badly although i wouldnt want to run them too soft. I think they equate to about 46 or 48c tyres.
Made my cross bike feel like a monster truck - in a good way.
A lot of mythology about tyre/rom compatability out there.
I've put a 2.4" tyre on a 80mm rim, it was rideable but maybe not clever for certain riding.
Also toured off road with a 2.5" on a 231cd.
[url= http://www.sheldonbrown.com/tire-sizing.html#width ]Sheldon to the rescue[/url]
I've used 28c tyres on my 29er Arch rims, but they are an absolute ******** to get on & off, so much so that I'm building up some dedicated road wheels instead.