Budwood from seven different clones of rubber tree(Hevea brasiliensis) was planted in replicated trials in four different test sites in the plateau region of Sao Paulo state, Brazil. The clones represented a range of imported germplasm, and the locations were selected to represent a range of rubber growing areas. Girths were measured for six years consecutively, before the initiation of tapping for latex. Total number of latex vessel rings (lvr) and bark thickness (bt) wre measured at six years. The largest average of all characters was observed in Matao. Overall means for girth, toal number of lvr and bt at six years were 35.26 cm, 11.3 and 4.83 mm, respectively. Both the test sites and clones showed statistically sifnificant differnces in girth, lvr and bt values. There were significant clone x site interactions. Girthat one year was not a reliable predictor of future field performance. Broad-sense heritablity for girth was 0.16, and for lvr and bt it was 0.28 and 0.40, respectively, at six years. Repeatability was quite high, from 0.52 to 0.75 for all characters in all years. When two clones out of seven were selected, expected genetic gain in girth was about 2.0;; for lvr and bt it was 7.0;and 14.6;, respectively.