Segway Custom Handelbar Grips, a photo by CraigShipp.com Photos - Events / People / Places on Flickr.
The original grips were getting sticky so I replaced them with Custom Handelbar Grips that are in fact replacement tennis racquet grips. They are fast and easy to install and look great. They should also last a long time. The reason I had to do this is the original rubber grips were failing and were getting very sticky. Also see http://SegwayMoments.com