hub sizes

hi, im wanting to buy the hope pro II hubs on the dt swiss 5.1d rims as my current back wheel is so bent it wont straighten but i looked on the hope website and saw some sizes, 110, 135 and 150mm im assuming thats the legnth of the hub/the distance between both dropouts on a frame? if im right what size would i need? on the site im looking to buy the wheels on it doesnt state the hub size but is 135mm like the most common size? thanks.
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Parktools :?:SheldonBrown