IV - THE MAIN PROBLEMS The 7 main defects
Graining (competition range)
Marble
Tyre damage / Wear
CHECKS / ADVICE 1. Increase the pressure (1.8 bar maximum for the rear ; 2.5 for the front) 2. Choose a softer compound and adapt pressure to type of use 3. Adjust the bike settings to make the rear tyre work correctlyDESCRIPTION
Formation of deep wrinkles, visible on the internal or external shoulder of the tyre.
CAUSES The mixture is not warmed up, the tyre is outside its window of use. The mixture temperature is too low; grip is therefore not generated.
Inner liner
CAUSES Puncture, pressure loss, under pressure riding, excessive load evolutions.
DEVELOPMENT Run-flat riding, tyre dislocation.
CHECKS / ADVICE Damage can not be seen from the outside of the tyre, in the case of puncture, the tyre must be demounted to be checked internally. A tyre with marbling evident is no longer fit for continued use and should be scrapped.
THE TYRE MUST NOT SHOW ANY SIGNS OF MARBLING BEFORE REPAIR.
DESCRIPTION The marble is a pleating of the inner liner. In the marbled areas, the rubber is blackened on a width which can have different sizes.
Type of wear crown
DESCRIPTION Uneven wear. Type of wear on crown: sawtooth wear in the rolling direction, max-min wear, evidence of wear on the shoulder, rail-type wear.
DEVELOPMENT If wear is too pronounced, risk of damage to the crown plies.
CHECKS / ADVICE Go over the history of the tyre (mileage, dates changed, load, front/rear fitment, etc.). Check conditions of use. Check if the size is suitable and the one recommended by the manufacturer. Check inflation pressure. Check the mechanical condition of suspension, steering and wheel bearing elements. Correct all mechanical anomalies on the vehicle. Do not exceed the recommended load.
Technical data
MICHELIN 2wheeL - 181