by rebound bumpers you mena the bump stop on the bottom of the shock?if so,then yes it is in there.the bike handles very well,and i never notice like a hard bottoming.it actually feels really good.i know it bottoms every now and then.if i come up short on the table top,it bottoms,if i come up short on the up hill,it bottms.thats all to be expected.i just don't understand why the bolts are bending.i guess i'll buy another stocker,and try it