Rubber composition contains precipitated silica filler having: specific surface BET 185-250 m/g and CTAB 180-240 m/g; pores of diameter 175-275 Angstrom (V2) representing 50% of pores of diameter up to 400 Angstrom (V1); volume Vd1 of pores of diameter 1 micro m is 1.65 cm/g; fines index (IF) 70-100 Angstrom ; and fine particles ratio and median diameter after ultrasonic de-agglomeration at least 50% and 5-7 microns, respectively. Independent claims are also included for (1) tire with reduced running resistance comprising S-vulcanizable diene rubber composition containing reinforcing filler in form of highly dispersible precipitated silica of properties as listed above; and (2) running thread for tires on base of S-vulcanizable diene rubber composition, comprising reinforcing filler in form of highly dispersible precipitated silica with properties as listed above.
