When you put on your new grips, spray the insides of them with hair spray, they will slide on super easy and the hair spray will dry within minutes. I've done this several times on my snowmachines and it works great.
What brand of hair spray? I was told to use hairspray to re-glue the handles on my exercise machines by a guy that owns a bike repair shop. It made the handles slip worse like I had oiled them. When I was a kid we used friction tape and gasoline.
