SINGAPORE, March 4 (Reuters) -

• Japanese rubber futures nudged lower on Tuesday as new U.S. tariffs on Canada, Mexico and top rubber consumer China are set to go into effect within hours, outweighing a tightening supply outlook.

• The Osaka Exchange (OSE) rubber contract for August delivery JRUc6, 0#2JRU: was down 2.5 yen, or 0.69%, at 359.7 yen ($2.41) per kg, as of 0214 GMT.

• The rubber contract on the Shanghai Futures Exchange (SHFE) for May delivery SNRv1 edged 45 yuan lower, or 0.25%, to 17,710 yuan ($2,430.32) per metric ton.

• The most active April butadiene rubber contract on the SHFE SHBRv1 fell 275 yuan, or 1.95%, to 13,850 yuan ($1,900.62) per metric ton.

• U.S. President Donald Trump said the implementation of 25% tariffs will take effect from Tuesday, causing automaker shares to slide. General Motors GM.N dropped 4% and Ford F.N slipped 1.7% in overnight session.

• The automobile sector is particularly likely to feel the impact of tariffs due to the supply chains that criss-cross the three countries, as well as the expected increase in vehicle prices, a professor said.

• Automobile sales could influence the intensity of automobile manufacturing, which involves using rubber-made tyres.

• Beijing vowed on Tuesday to retaliate against fresh U.S. tariffs after Trump threatened an extra 10% duty on Chinese imports, leading to a cumulative 20% tariff.

• Still, domestic production areas in China have stopped harvesting while the supply in southern Thailand has shrunk, ushering the global natural rubber supply to a seasonal low, said Chinese commodities data provider Longzhong Information in a note.

• Rubber crops usually undergo a season of low production from February to May, before a peak harvesting period that lasts until September.

• The front-month rubber contract on Singapore Exchange's SICOM platform for March delivery STFc1 last traded at 204.5 U.S. cents per kg, down 0.1%.

($1 = 149.1300 yen)

($1 = 7.2871 Chinese yuan)

(Reporting by Michele Pek; Editing by Sherry Jacob-Phillips)

((michele.pek@thomsonreuters.com;))