Pneumatic tire

1. A pneumatic tire having a tread comprising a vulcanizable rubber composition comprising, based on 100 parts by weight of elastomer (phr),

(A) from about 20 to about 100 phr of a solution polymerized styrene-butadiene rubber having a glass transition temperature (Tg) ranging from −85° C. to −50° C.;

(B) from 0 to about 40 phr of a natural rubber or synthetic polyisoprene;

(C) 0 to about 30 phr of cis-1,4 polybutadiene having a Tg of from −110° C. to −90° C.;

(D) from 0 to 50 phr of a process oil;

(E) from 55 to 80 phr of a hydrocarbon resin having a Tg of at least 30° C.; and

(F) from 90 to 150 phr of silica.

2. The pneumatic tire of claim 1 , wherein the hydrocarbon resin is selected from the group consisting of styrene/alphamethylstyrene copolymer resins, C5/C9 copolymer resins, dicyclopentadiene resins, and aromatic dicyclopentadiene resins.

3. The pneumatic tire of claim 1 , wherein the resin is an aromatic modified dicyclopentadiene resin.

4. The pneumatic tire of claim 1 , wherein the resin is a styrene/alphamethylstyrene copolymer resins.

5. The pneumatic tire of claim 1 , wherein the resin is a DCPD-based resin comprising from about 5 to about 90 mol % units derived from DCPD.

6. The pneumatic tire of claim 1 , wherein the resin is a DCPD-based resin comprising from 1 to 20 mol % aromatic hydrogen.

7. The pneumatic tire of claim 1 , wherein the resin is a C5/C9 resin comprising 50-90% (by weight) piperylenes, 0-5% isoprene, 10-30% amylenes, 2-5% cyclics, 4-10% styrenics, and 4-10% indenics.

8. The pneumatic tire of claim 1 , wherein the resin is a C5/C9 resin comprising an aromatic hydrogen content between 3 and 15 mole percent.

9. The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and at least one functional group selected from the group consisting of primary amines and thiols.

10. The pneumatic tire of claim 1 , wherein the oil is selected from the group consisting of aromatic, paraffinic, naphthenic, IVIES, TDAE, heavy naphthenic oils, and vegetable oils.

11. The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber functionalized with an alkoxysilane group and a primary amine group, and is represented by the formula (1) or (2)

wherein P is a (co)polymer chain of a conjugated diolefin or a conjugated diolefin and an aromatic vinyl compound, R 1 is an alkylene group having 1 to 12 carbon atoms, R 2 and R 3 are each independently an alkyl group having 1 to 20 carbon atoms, an allyl group or an aryl group, n is an integer of 1 or 2, m is an integer of 1 or 2, and k is an integer of 1 or 2, with the proviso that n+m+k is an integer of 3 or 4,

wherein P, R 1 , R 2 and R 3 have the same definitions as give for the above-mentioned formula (1), j is an integer of 1 to 3, and h is an integer of 1 to 3, with the provision that j+h is an integer of 2 to 4.

12. The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and a primary amine group comprises the reaction product of a living polymer chain and a terminating agent of the formula

RN(CH 2 ) x Si—(OR′) 3 ,  I

wherein R in combination with the nitrogen (N) atom is a protected amine group which upon appropriate post-treatment yields a primary amine, R′ represents a group having 1 to 18 carbon atoms selected from an alkyl, a cycloalkyl, an allyl, or an aryl; and X is an integer from 1 to 20.

13. The pneumatic tire of claim 1 wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and a thiol, and comprises the reaction product of a living anionic polymer and a silane-sulfide modifier represented by the formula

(R 4 O) x R 4 y Si—R 5 —S—SiR 4 3

wherein Si is silicon; S is sulfur; O is oxygen; x is an integer selected from 1, 2 and 3; y is an integer selected from 0, 1, and 2; x+y=3; R 4 is the same or different and is (C 1 -C 16 ) alkyl; and R 5 is aryl, and alkyl aryl, or (C 1 -C 16 ) alkyl.

14. The pneumatic tire of claim 1 , wherein the amount of the styrene-butadiene rubber ranges from 70 to 90 phr.

15. The pneumatic tire of claim 1 , wherein the amount of the natural rubber or synthetic polyisoprene ranges from 15 to 30 phr.

16. The pneumatic tire of claim 1 , wherein the amount of the polybutadiene ranges from 5 to 15 phr.

17. The pneumatic tire of claim 1 , wherein the amount of the oil ranges from 1 to 20 phr.