i know a few people who use open pro's for 29" wheels without problems. however, one person i know was running low pressure with them on 2.3 29" tires with the stan's tubless conversion and rolled the front tire off the rim! but they should handle large cross tires no problem. fwiw, i run delgato's on my ss 29" and think they're great rims. i like that they're machined and eyeleted and tough and relatively light. i think you'd be fine with them as 'cross rims.