The document lists some of the most expensive bicycles in the world, ranging in price from $44,000 to $500,000, including Aurumania's Gold Bike Crystal edition costing $144,464, Trek Yoshimoto Nara Speed Concept at $200,000, and the most expensive being Trek "Butterfly" Madone priced at $500,000.

1. Costliest bicycles Nishant chauhan

2. Aurumania’s Gold Bike Crystal edition ($144,464)

3. Trek Yoshimoto Nara Speed Concept ($200,000)

4. Trek “Butterfly” Madone ($ 500,000)

5. The Trek Madone 7-Diamond ($75,000)

6. Electric Assist Bicycle by eROCKIT ($44,000)