I've been trying to find some bar ends for my bike...2013 Giant Rove3. I want to start riding more and my hands and wrist start to hurt after awhile. Having problems finding some for 31.8 bars. Are they made that size or do I have to get different grips? If I'm not mistaken the 31.8 is the diameter for the bar by the stem...so the bar size the grip is on could be ...?