I've been having problems with a 28 spoke rear wheel, spokes loosen and occasionaly break. The rim is a Weinmann TR18, laced to a Joytech hub . I'm 235lbs, ride mostly smooth roads with occasional areas of patched pavment, never hop curbs, take up bumps with my arms and legs. This is my everyday ride, not a touring bike. Your opinions on whether this wheel is too light or just needs more attention being tuned.