I took this off Bicycle Wheel Warehouse for the Open Pro, I run 700x32 on my commuter with no problems, and I go 275 and add another 20lbs in my bags when I commute:

Hubs: Shimano Ultegra 6700® series, 8/9/10 speed compatible, 32 hole, silver gray

Spokes: DT Swiss silver or black double butted Competition®, 2.0/1.8/2.0 (please select)

Nipples: DT Swiss brass or alloy nipples (please select)

Weight w/ alloy nipples (approx.): Front = 822g, rear cassette = 1030g, Set = 1852g

Weight w/ brass nipples (approx.): Front = 842g, rear cassette = 1050g, Set = 1892g

Valve Type: Presta

Tire Sizes: 700 x 20 - 700 x 32