These are OEM wheels, like machine built. They might be okay and somewhat durable as far as rims. The TA-20's are OEM rims not normally listed for retail on Alexrims.com so it's hard to judge what's inside the double box. But if it's like most of the Alex rims I've built and ridden, it's probably just fine. The issue is more with the spokes on the rear. At 250lbs, might not be a problem. But I'm about 25 lbs heavier than you and just sprinting up hills on my SS/Fixie with DC19 rims has broken OEM spokes. The rim was tough though and went through 3 spoke repairs in a month (at about 800 miles) before I trashed it and rebuilt the whole thing which solved my spoke problems.