pick up a 32 spoke rear wheel and swap it with the one on the Giant. You should be just fine if you are under 400 pounds. My bike shop sells them. Me I ride an Orbea Orca and am 360 pounds. The Orca came with 32 spoke wheels and I haven't had issue other than occasionally tightening spokes after hitting a pretty good bump (wasn't able to slow as much as I would have liked crossing train tracks).