Originally Posted by
Doctor Morbius
Ideally your fingers should last a lifetime. However, you shouldn't really be numb when you ride. I had to have carpal tunnel surgery in both wrists for the numbness to go away. The cause of your numbness may be related to something else. Best to see a doctor, who can refer you to a specialist that deals with such matters.
OP's problem is ulnar nerve compression (5th and half of 4th fingers). Carpal tunnel surgery won't help him. The question is where the nerve is being compressed, and why. The most usual reason is overuse of the upper arm, especially tripceps, with poor ergonomics. Like a long bike ride with ill-fitting frame and handlebar geometry.