I asked about tire break in as there are Wayyy too many opinions and damned little fact. HERE is their answer:
Thanks for the questions. There are common mis-conceptions about tires that never seem to go away. Let us explain the details in the following method.
The idea of the breaking in a new tire is as follows. First is that after the install the tire will move ever so slightly on the rim to seat itself in the first few miles. The break in procedure we suggest is somewhere between 3 corners of the first lap for a race tire on a race track to about 300 miles for a touring tire. Why? Well the extreme forces generated to the soft race compound tire by a expert rider will break in the tire in the first few corners of the race track. Then on the other end you we have a guy on a Harley riding on public roads at legal speeds gently scrubbing in the tires over the 300 or so miles of use. Now let's talk about scrubbing. When the tire is new the very sharp edges of the tread grooves combined with the tire's smooth surface GIVE the impression of a slippery tire, but that is not the case. This new tire is sensitive to the various bumps, grooves, holes of the pavement and this sensitivity is what most consumers think is the slippery feeling. So as you can see the point of the breaking in tires is to help the you get used to a new (non worn out) quicker and better handling tire at a easy pace and to knock off the sharp edges and scuff the tread blocks.
We hope this helps answer your questions and ride safe.
US Pirelli Moto
800 747-3554, prompt 2