The throttle sleeve is made so that you can't replace the grips w/o replacing the throttle sleeve too. the thing has these molded in "ridges" for lack of a better word that fit into cutouts in the grip and you can't even remove the stock grip from the sleeve w/o cutting it off. then a new grip won't go on. You CAN cut all the ridges off like i did. But even then it doesn't fit well for several reasons too longwinded to go into. I actually decided i preferred the stockers and had to buy a new set which of course comes with the throttle sleeve with grip in place. Cost me a lot more than those after market grips i tried !