The gp series is a perfect solution for common wrist pain during cycling. In particular the gripshiftreg version offers an ergonomic approach to double twist shift pain relief. Further benefits of this grip are the pure rubber compound easy to install clamping mechanism approved back friendly ergonomics and approved for carbon handlebars. Two sizes ndash for individualized control in order to help you maintain perfect control over your bike your hands should not completely envelop the grip which is why ergon offers many grips in two size diameters ndash small and large. The difference refers to the grip width hand size meaning a larger hand will have a more positive fit on a thicker grip while a smaller hand is better fit to a smaller grip. For hand glove sizes 6.5 to 8.5 we recommend small for 8.5 to 10.5 large usually is better.