Abstract: A rubber composition is based on at least one non-functionalized first diene elastomer E1 having a glass transition temperature TgE1, one functionalized second diene elastomer E2 having a glass transition temperature TgE2, a reinforcing filler capable of interacting with the functionalized diene elastomer E2 and a crosslinking system, in which: the glass transition temperature TgE1 is above or equal to -50° C., the glass transition temperature TgE2 satisfies the mathematical relationship TgE2 ? TgE1-23° C., and the content of the non-functionalized diene elastomer E1 is greater than or equal to 50 phr. A tread and/or a pneumatic or non-pneumatic tire may comprise at least one composition as defined above.

Abstract: A rubber compound having at least two glass transition temperatures Tg1 and Tg2 is based on at least two rubber compositions C1 and C2, C1 comprising at least one elastomer E1 with Tg1, C2 comprising at least one elastomer E2 with Tg2 and a reinforcing filler, E2 being different from E1, where Tg1 is above or equal to -50° C., the rubber compound satisfies Tg1-Tg2 ? 23° C. and has a loss factor profile exhibiting the change in tan ? as a function of the temperature in °C. over a range extending from -80° C. to 60° C. at a frequency of 10 Hz and a constant stress of 0.7 MPa and exhibiting one or more peaks, such that all the tan ? peaks present at a temperature above Tg1 have a width at half height less than or equal to 23° C.; and E1 is predominant.

Abstract: Tire tread is made up of a radial superposition of a first portion (21) and of a second portion (22) radially on the outside of the first portion (21). The first portion (21) is made up of a radial superposition of N layers C1i, each layer C1i having a radial thickness E1i that is substantially constant and being made up of a polymer material M1i having a dynamic shear modulus G1i. The second portion (22) is made up of a single layer C2 having a radial thickness E2 that is substantially constant and being made up of a polymer material M2 having a dynamic shear modulus G2. The following relationships are simultaneously satisfied: 1/(E1/G1+E2/G2)>G0/(E1+E2), where E1=?i=1NE1i, G1=E1/(?i=1NE1i/G1i) where E1i, E1, E2 in mm, G1i, G1, G2 in MPa and where 1 MPa?G0>1.8 MPa ??a. G1<G0 ??b. E1?E1min=25 mm ??c. G2>G0>G1 ??d. E2?E2max=70 mm ??e. 1/(?i=1jE1i/G1i)<1/(?i=j+1NE1i/G1i) for 1?j?N-1 ??f.