Brompfication One Piece Cassette – 4 Speed

The Brompfication One-Piece Cassette in Gold is a lightweight, high-performance upgrade for Brompton P-Line and T-Line bikes. Precision CNC-machined from a single block of aluminum, it maintains the original 11-13-15-18T gear ratio while weighing just 33 grams—including the lockring—saving 47 grams over the stock cassette. Multiple layers of PVD coating enhance durability, and an included 1 mm spacer allows for the removal of the plastic chain guard, shedding an additional 12 grams. Designed for smooth shifting and optimal efficiency, this cassette brings weight savings and precision to Brompton’s compact gearing system.