Belt module (20, 310, 320, 330) comprising: an intermediate section (23, 314, 324, 333) including a cross rib (123; 328) having a corrugated portion extending along at least a portion of the length of the intermediate section (23, 314, 324, 333) and the intermediate section (23, 314, 324, 333) having a web (130; 317, 327) extending along the whole length of the intermediate section (23, 314, 324, 333) and adjacent to the cross rib (123; 328), the web (130; 317, 327) forming a top surface of the intermediate section (23, 314, 324, 333) and being wider than the cross rib (123; 328); a plurality of first link ends (35, 315, 325, 339) extending outward from the intermediate section (23, 314, 324, 333) and having a transverse opening defined therein, the link ends (35, 315, 325, 339) having a pair of spaced apart link members (62, 65) and having an end portion connecting the link members (62, 65), the link ends (35, 315, 325, 339) having a slot defined therein which comprises an opening extending from a top surface of the link end (35, 315, 325, 339) to the bottom surface of the link end (35, 315, 325, 339); and a plurality of second link ends (94, 318, 342, 366) extending outward from the intermediate section (23, 314, 324, 333) in a direction opposite the first link ends (35, 315, 325, 339), the second link ends (94, 318, 342, 366) having a transverse opening with an elongated shape defined therein, the link ends (94, 318, 342, 366) having a pair of spaced apart link members (206, 209) and having an end portion connecting the link members (206, 209), the link ends (94, 318, 342, 366) having a slot defined therein which comprises an opening extending from a top surface of the link end (94, 318, 342, 366) to the bottom surface of the link end (94, 318, 342, 366); wherein the corrugated portion of the cross rib (123; 328) comprises alternate reach bar portions extending between first (35, 315, 325, 339) and second (94, 318, 342, 366) link ends and border portions disposed adjacent to the slots (92, 117) formed in the link ends (35, 94, 315, 318, 325, 339, 342, 366); and wherein the difference between the width of the web (130; 317, 327) and the width of the cross rib (123; 328) at a side edge of the module (20, 310, 320, 330) is greater than the difference between the width of the web (130; 317, 327) and the width of the cross rib (123; 328) near the edge opposite from the side edge. an intermediate section (23, 314, 324, 333) including a cross rib (123; 328) having a corrugated portion extending along at least a portion of the length of the intermediate section (23, 314, 324, 333) and the intermediate section (23, 314, 324, 333) having a web (130; 317, 327) extending along the whole length of the intermediate section (23, 314, 324, 333) and adjacent to the cross rib (123; 328), the web (130; 317, 327) forming a top surface of the intermediate section (23, 314, 324, 333) and being wider than the cross rib (123; 328); a plurality of first link ends (35, 315, 325, 339) extending outward from the intermediate section (23, 314, 324, 333) and having a transverse opening defined therein, the link ends (35, 315, 325, 339) having a pair of spaced apart link members (62, 65) and having an end portion connecting the link members (62, 65), the link ends (35, 315, 325, 339) having a slot defined therein which comprises an opening extending from a top surface of the link end (35, 315, 325, 339) to the bottom surface of the link end (35, 315, 325, 339); and a plurality of second link ends (94, 318, 342, 366) extending outward from the intermediate section (23, 314, 324, 333) in a direction opposite the first link ends (35, 315, 325, 339), the second link ends (94, 318, 342, 366) having a transverse opening with an elongated shape defined therein, the link ends (94, 318, 342, 366) having a pair of spaced apart link members (206, 209) and having an end portion connecting the link members (206, 209), the link ends (94, 318, 342, 366) having a slot defined therein which comprises an opening extending from a top surface of the link end (94, 318, 342, 366) to the bottom surface of the link end (94, 318, 342, 366); wherein the corrugated portion of the cross rib (123; 328) comprises alternate reach bar portions extending between first (35, 315, 325, 339) and second (94, 318, 342, 366) link ends and border portions disposed adjacent to the slots (92, 117) formed in the link ends (35, 94, 315, 318, 325, 339, 342, 366); and wherein the difference between the width of the web (130; 317, 327) and the width of the cross rib (123; 328) at a side edge of the module (20, 310, 320, 330) is greater than the difference between the width of the web (130; 317, 327) and the width of the cross rib (123; 328) near the edge opposite from the side edge.