mongoose單車比較

請各位單車達人幫幫忙....小弟最近看上了mongoose的單車....但是(TY-S)和(AS-C)這兩輛的差別在於什麼地方?
是只有24速和27速的差別嗎....請大大幫幫忙.....謝謝^^

http://www.hy-bike.com/product.php?mode=show&cid=98&pid=399


http://www.hy-bike.com/product.php?mode=show&cid=99&pid=400