specs diffence
 

hi i am looking at getting my first real bike. all the specs seem the same expect derail er and brakes. is the acera that much better then the altus. is hydro better then the mechanical. here are the bikes i am looking at.
hardrock disc se 29 $520
hardrock disc 29 $590
x caliber 4 $550
revel 29er $550
or should i save up some more and get the.
hard rock sport disc $700
x caliber 5 $660
yes i did read the to buy forum but it takes months for some one to get back to you. if they even do.