How tightly are you grasping your handlebars? On the road bike, unless you're on bad, uneven surfaces, you don't need to use "GI Joe kung fu grip." But if you're riding for an hour, grasping the bars with white knuckles...that might be causing pain the next day.
Another possible cause/need for the extreme grip (if that's the root cause of your pain) is if the bike isn't tracking accurately. Are you able to ride with no hands, and the bike continues to go straight? Or do you have to maintain a grip on the bars because the bike veers? If it veers, make the proper adjustments so that it doesn't do that. Then, don't grip the bars so tightly, and change your hand positions, and flex your fingers and wrists frequently, while riding.
Dan
Last edited by _ForceD_; 11-10-19 at 09:45 AM.