Too much bevel will shorten the span.

Too little you can get rubbing at the base of the thumb.

Theoretically though if everything was just right and you release correctly, you wouldn't need any bevel.

Too much bevel will shorten the span.

Too much bevel and it can feel like you have a shortened span because the proper support for your thumb is there. The top of your thumb could be closer, DEPENDING ON WHERE THE BEVEL IS ON THE THUMB HOLE. The lower part of your thumb will still be in the same position.

Too little you can get rubbing at the base of the thumb.

Too little bevel and you may not get your thumb all the way into the hole. You MAY get rubbing, again, depending on where the bevel is on the thumb hole. It is not in the same place for every one.

Theoretically though if everything was just right and you release correctly, you wouldn't need any bevel.

If everyone's thumb was exactly the same shape and all the bones, ligaments and tendons and webbing  (between thumb and index finger) were all the same size and in the same location, THEN no one would need any bevel.

Some people need more AND different beveling than others do. Some people fee more comfortable with different amounts of beveling. Not everyone is the same in needs, feeling, wants, desires and hand strength.

Too much bevel too much thumbbb gripping

0 to Too little bevel perfect.

Flat Ten.
Trip the 4.

Too little side bevel and one will tend to hang on the side and pull the ball.

Too little front bevel will cause one to hang, go down the lane with the ball, or worse end up with front of thumb nerve damage.  The dreaded black line.

I am not an advocate of lots of bevel!  Just like oatmeal, not to hot, not to cold, just right.

The Mo Pinel bevel method provides that Goldilocks setup.

Regards,

Luckylefty

If you need side bevel to get out of a ball, I would check your lateral pitches.

I'm right handed and I just know that I used to need a ton of bevel on the left side of my thumb hole (looking down on the grip) to get out of the ball.  I also needed a pretty loose thumb and even then I still couldn't release the ball cleanly.   It wasn't until I went farther right in my thumb lateral that I was able to get out of a thumb with barely any bevel and a snug fit.  Now my bevel is mainly for comfort and not for clearing the thumb.  Of course make sure your spans are correct first.  That is most important.

Bevel is merely a band aid for an improper angle