On sweet cherry trees a relationship between crop load index and fruit quality (fruit weight, soluble solids contain and colour) has been reported by several authors. In order to establish these relations for the local conditions of Mendoza, Argentina, we started an experiment on sweet cherry trees cvs. 'Rainier' and 'Bing' with the following objectives: 1) to establish the quantitative relationships of different crop load indexes and fruit size, and to identify the best model; 2) to determine the relationship between the crop load index selected with fruit colour and soluble solids; 3) to analyse the distribution of fruit sizes according to the crop load index selected, and 4) to estimate the fraction of exportable fruit for each crop load level. These trees for the study were selected based on trunk cross sectional area (TCSA). Several crop load indexes were elaborated based on number of fruits, spurs, and leaves. Branch volume was estimated based on branch length and cross sectional area. Fruit weight, colour, and soluble solids were also included in the indexes. The results showed a strong correlation between the crop load index (number of fruit / TCSA) and fruit weight, and between crop load index and soluble solids, but not with fruit colour. For each sweet cherry cv. a different model of the relation crop load:fruit weight was obtained. There was an inverse relation between crop load and the fraction of fruit with larger sizes.