I'm considering buying an extra set of wheels for my mountain bike to keep street tires and a smaller cog/freewheel mounted on for quick conversions for city duty. I found a cheap set of stock Karate Monkey wheels with Surly hubs on Craigslist, but I'm wondering if I will have chain line issues with my 15g crankset (73mm bottom bracket). Anyone know if the freewheel will line up?

Thanks