Drivetrain |
Brompton Wide-range 6 speed drivetrain (2 x 3 speed), 302% range |
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Frame |
Main Frame : Precision drawn heat-treated steel tubing with hand brazing and selected auto-brazed joints
Rear Frame : Hand brazed cold-formed micro-alloy steel tubing |
Hi-Ten steel, BMX geometry |
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Stem |
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Mongoose, threaded top load, 50 mm |
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Handle Bar |
High Handlebars – Brompton triple butted 6061 aluminium handlebar with shot-peened finish |
Mongoose, Hi-Ten steel, 26 in width, 7 in rise, 22.2 mm clamp |
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Fork |
Steel brazed fork |
Hi-Ten steel, 20”, steel steerer, 3/8” x 100 mm |
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Seatpost |
Brompton standard length Chromoly steel tube. Suitable for maximum inside leg 33″/84cm |
Steel, 250 mm, 25.4 mm |
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Grip |
Lock-on grips with soft-compound rubber adhered to an engineered core |
Mongoose Zig, 130 mm |
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Crankset |
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1-piece, forged steel, 36T steel chainring |
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Pedals |
Brompton Folding left hand and non-folding right-hand pedals |
BMX, nylon |
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Chain |
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KMC |
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Shifters |
Brompton 2 and 3 speed Trigger shifters |
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Saddle |
Brompton saddle with integrated carry handle. Incorporates a mount for a Brompton rear light and saddle bag |
Mongoose, steel rails |
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Headset |
Brompton headset |
Threaded, 1” external, ball bearing |
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Hub Front |
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Steel, ball bearing, 3/8 in axle, 36H |
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Hub Rear |
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Steel, ball bearing, 3/8 in axle, 36H |
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Spoke |
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14G, steel, black |
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Chainrings |
44T (-12% gearing) |
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Bottom Bracket |
Square taper bottom bracket |
American loose ball, American loose ball |
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Front |
349 x 35C Schwalbe Marathon Racer. A puncture resistant tyre with a reflective sidewall |
20 in x 2.0 in, wire bead |
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Rear |
349 x 35C Schwalbe Marathon Racer. A puncture resistant tyre with a reflective sidewall |
20 in x 2.0 in, wire bead |
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Wheel / RIM |
Front-wheel: Double-wall rim, 28 spokes laced to a Brompton front hub.
Rear-wheel: Double wall rim, 28 spoke, Brompton Wide ratio 3 speed internal gear hub with 2 speed external gears (13 and 16 tooth) |
Aluminum single wall, 20 mm ID, 36H |
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Tube |
Schrader valve |
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