ROCKBROS 20" 9S Folding Bike4130 Cr-Mo Steel FrameLug Copper zing WeldingHigh Strength Gravel TireMulti-terrain Foldable Bicycle for Commute Outdoor Travel

The product is currently in pre-sale status, with an estimated delivery time of around 15-25 daysProduct Features1.Hydraulic disc brake 20'' 9-Speed 11-34T 11.7KG Folding Bicycle2.Manual welding LUG copper brazing frame3.Chromium molybdenum 4130 steel Aerospace grade high-strength/fatigue/impact resistance4.MicroShift Advent 9S freewheel‌ 11-34T4130 Chromoly Steel Frame with LUG Brazing.Crafted using traditional LUG and copper brazing, this ROCKBROS folding frame eliminates the stress concentration of TIG welding.Enhanced joint strength, lasting durability, and the timeless aesthetic of a classic steel buildBuilt for Gravel Versatility.Constructed from 4130 chromoly steel for corrosion resistance and that signature compliant ride feel.Paired with 20-inch gravel tires, it smooths out rough pavement and loose terrain—delivering a comfortable, capable ride wherever the road leadsBalanced All-Road Componentry.The MicroShift Advent 9-speed drivetrain offers a wide gear range with support for up to 36T cassette, giving you flexibility to tailor your setup.Braking is handled by forged CNC-machined hydraulic disc brakes, delivering powerful, consistent stopping power without excess weightExceptional Weight-to-Portability Ratio.At approximay 11.7kg, this folding gravel bike balances rigidity, weight, and compactness.Fold it down to fit easily in car boots or tight spaces—ready for spontaneous bike-packing adventures without compromiseComfort-Optimized Endurance GeometryDesigned for long-distance rides, the frame geometry increases steering stability and tracking confidence while reducing localized muscle fatigue—keeping you comfortable and controlled mile after mile