As Indonesian President Joko Widodo led Anthony Albanese around the lush gardens of a presidential palace south of Jakarta earlier this month, he presented the new Australian prime minister with an unusual gift: a bamboo bike. The night before, designer Singgih Susilo Kartono learned it would be the Spedagi model he crafts in a small village on the island of Java that the leaders would ride side-by-side in a unique moment of bicycle diplomacy. Prime Minister Albanese would tuck his trousers into his socks after the statesmen stripped off their jackets and ties and donned helmets, setting off o…