How do I put grips on mountain bike handlebars?
Two solutions I've used:


Spray the inside of the grip with hair spray. Slide it on immediately, and then when the hair spray dries, it will glue the grip in place. 
Use rubbing alcohol. It does not do as good of a job at locking the grip in place, but it does evaporate quickly and doesn't leave any lubricant inside the grip.