Different measuring and manufacturing processes at belt manufacturers arise between manufacturers of different lengths. However, these differences do not affect the functionality of the belt. Different industry standards different paramaters are used to determine the length information. And to the external length (external length, short Le), internal length (internal length, short Li) the differentiated and effective length. The actual length thus describes the length measurement of approximately 3/4 of the belt height according to din 2215a Furthermore, the predetermined belt tension from the vehicle manufacturer must be included for reliable length measurement, as these also an important factor in the process of production. Due to these different measurement methods it can lead to different belt sizes from different manufacturers in the same vehicle. Please based solely on our vehicle duties. Dayco designs, develops and manufactures complete power transmission systems for the original equipment, original spare parts market and aftermarket of automotive commercial vehicles and scooters. 18.2 x 810 mm