British Prime Minister Tony Blair (L) and Spanish Prime Minister Jose Maria Aznar Lopez ride their bikes, which were given as a present by the Mayor of Amsterdam Patijn, as German Chancellor Helmut Kohl (far L) continues by foot after refusing to ride his bike, in Amsterdam June 17. European leaders began a final push on Tuesday to complete a new treaty to modernise the bloc as it enters the new century after agreeing on the stability and jobs pact on their first day of meetings on Monday.