Tire Shaving Offers many advantages o the serious competitor. When a tire is shaved to 4/32 or 5/32 a nember of thing change in the tire.
Firstly, the contact patch is increased.
In addition the tire will exibit less squirm, improving feel and response.
Another great advantage is the reduction of rotating mass. This can be quite significant, depending on tire size. The weight being removed is at the longest part of the level arm and will have the greatest impact on accelleration and braking. .