The G Line in Forest Green is Brompton's biggest engineering leap in 50 years — a folding adventure bike with 20-inch wheels, disc brakes, and the confidence to take you far beyond the city. Same iconic fold. Completely reimagined capability.
20-inch wheels with Schwalbe G-One All Round 54mm tubeless-ready tires — built for gravel, trails, and long-haul roads
Hydraulic disc brakes — Brompton's first, for consistent stopping power in wet conditions and on steep terrain
Shimano Alfine 8-speed internal hub — enclosed gearing for reliable, low-maintenance shifting in any weather
Hand-brazed steel main frame with aluminium fork; mounting bosses for water bottle cages and accessories
Folds in under 20 seconds — 690 × 730 × 402mm folded, tows upright on its rack wheels
