Vulcanizable rubber mixtures comprising at least the following components: I.) 100 parts by weight of an oil-free rubber matrix consisting of a) 15 to 79 parts by weight, preferably 20 to 70 parts by weight, of at least one solution SBR (S-SBR) (oil-free) having a glass transition temperature (Tg (S-SBR)) between -70°C and -10°C, b) 20 to 75 parts by weight, preferably 25 to 70 parts by weight, of at least one 1,4-cis-polybutadiene (oil-free) having a glass transition temperature (Tg) between -95°C and -115°C, c) 1 to 37.5 parts by weight, preferably 5 to 35 parts by weight, of natural rubber (oil-free) and/or at least one synthetic polyisoprene (oil-free) having a glass transition temperature (Tg) between -50°C and -75°C, II.) at least one hydroxyl-containing microgel based on polybutadiene, III.) at least one hydroxyl-containing, oxidic filler, IV.) at least one polysulphide-containing alkoxysilane, V.) at least one vulcanizing agent, VI.) optionally at least one rubber additive wherein the oil-free rubber matrix I.) has a glass transition temperature (Tg (matrix)) between -70°C and-90°C, the Tg (Matrix) being calculated by the general equation Tg matrix = X BR × Tg BR + X S − SBR × Tg S − SBR + X NR × Tg NR where glass transition temperature of the rubber matrix (oil-free) Tg (matrix) parts by weight of 1,4-cis-polybutadiene (oil-free) X parts by weight of S-SBR (oil-free) X (S-SBR) parts by weight of NR or IR (oil-free) X glass transition temperature of 1,4-cis-polybutadiene (oil-free) Tg glass transition temperature of S-SBR (oil-free) Tg (S-SBR) glass transition temperature of NR or IR (oil-free) Tg, characterized in that the hydroxyl-containing microgel has a gel content of more than 70% by weight, preferably more than 75% by weight, especially preferably more than 80% by weight, or in that the hydroxyl-containing microgel II.) has a glass transition temperature (Tg (MICROGEL)) between -82°C and -60°C, preferably - 65°C and -82°C, especially preferably -70°C and -80°C. I.) 100 parts by weight of an oil-free rubber matrix consisting of a) 15 to 79 parts by weight, preferably 20 to 70 parts by weight, of at least one solution SBR (S-SBR) (oil-free) having a glass transition temperature (Tg (S-SBR)) between -70°C and -10°C, b) 20 to 75 parts by weight, preferably 25 to 70 parts by weight, of at least one 1,4-cis-polybutadiene (oil-free) having a glass transition temperature (Tg) between -95°C and -115°C, c) 1 to 37.5 parts by weight, preferably 5 to 35 parts by weight, of natural rubber (oil-free) and/or at least one synthetic polyisoprene (oil-free) having a glass transition temperature (Tg) between -50°C and -75°C, a) 15 to 79 parts by weight, preferably 20 to 70 parts by weight, of at least one solution SBR (S-SBR) (oil-free) having a glass transition temperature (Tg (S-SBR)) between -70°C and -10°C, b) 20 to 75 parts by weight, preferably 25 to 70 parts by weight, of at least one 1,4-cis-polybutadiene (oil-free) having a glass transition temperature (Tg) between -95°C and -115°C, c) 1 to 37.5 parts by weight, preferably 5 to 35 parts by weight, of natural rubber (oil-free) and/or at least one synthetic polyisoprene (oil-free) having a glass transition temperature (Tg) between -50°C and -75°C, II.) at least one hydroxyl-containing microgel based on polybutadiene, III.) at least one hydroxyl-containing, oxidic filler, IV.) at least one polysulphide-containing alkoxysilane, V.) at least one vulcanizing agent, VI.) optionally at least one rubber additive