If you're holding the tube in your hand, and on most bike frames, I'd agree. However, I've ridden some real stinkers with 531 that were every bit as heavy and ponderous as any other steel pipe bike. Some Shogun and Centurion bikes, even with Tange Champion 5, were pretty nice riders. Until any frame is being ridden on trued and tensioned wheels, there is just no way to tell, but in general, I'd say the 531 bikes were built a level higher than the Tange C 5 bikes. But not all.