One bike came with cheap plastic hand grips, about as thin as they make them. These would be a good size for a child, but they were too thin for an adult. I bought some synthetic rubber hand grips, and stretched them over the thin plastic ones. This made them much more comfortable.
If anyone has hand grips that are too thin, consider doing something similar.
You can probably buy more expensive hand grips. But I have one set of cheap hand grips, over another set of cheap hand grips, and they work well.
I generally don't like cheap grips because they don't perform well if it rains or when you're hands start sweating. You lose a lot of grip, so do let us know about the performance. Preferably, silicon grips are cheap and perform better for me over plastic
As already mentioned, anyone doing this should pre-stretch the hand grips. I pushed them over the necks of bottles. See if others can come up with other ideas. Anyone not in a hurry, should pre-stretch them longer than I did, maybe two weeks or more.
Something I have not tried, but is worth experimenting with, is warming up the hand grips before trying to stretch them. You could leave them in the sunlight, or put them in warm water for awhile.
Anyone doing this, share your experience.
I always seem to go through grips on mountain bikes and Bmx bikes but I usually just buy the cheap normal ones, but this could be a good call as my current Bmx grips ripped in middle on both sides and just hanging on but if I had two I suppose even if the top pair ripped it would slide around at least