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@gbj_tester
I've run 35s on Open Pros, but it's well outside the manufacturer's recommendation and not a good idea. If you're going to run 32 to 35, you want at least a 23mm wide rim, like a velocity A23 or DT TK7.1, or maybe even a bit wider. Wider rims allow you to run lower pressure for the same stability and rolling resistance, or the same pressure gives better ride handling and lower rolling resistance. A 23mm rim (i.e. 19mm inside) gives a base to the tyre that's over 20% wider than an Open Pro. Tyre volume is increased and the contact patch gets wider and therefore (at the same pressure) shorter. 2010 is all about wide rims.