Benchmark Tokyo rubber futures ended 1.1 percent lower on Tuesday, weighed down by a stronger yen and weak Shanghai futures amid worries over growing demand by top rubber consumer China. The Tokyo Commodity Exchange rubber contract for December delivery finished 1.7 yen lower at 159.8 yen per kg. The most-active rubber contract on the Shanghai futures exchange for September delivery fell 45 yuan to finish at 11,840 yuan per tonne. The front-month rubber contract on Singapore's SICOM exchange for August delivery last traded at 133.50 US cents per kg, down 1.8 cents.