Bike Design & Folding-Bike Engineering
Meet the Brompton — the why behind the wrench.
After two seasons on a cruiser, the Brompton enters as the engineering object lesson. Frame geometry, the hinge, 16-inch wheels, materials, manufacturing, the fold, and what folders mean for urban transport.
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Frame Geometry
Head angle, trail, wheelbase.
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The Hinge
Load paths, fatigue, fifty years of one design.
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Wheels Small
16-inch engineering and gyroscopic feel.
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Drivetrain on a Folder
Chain line, gear range, ratio math.
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Materials & Manufacturing
Steel vs. titanium vs. aluminum, brazing vs. welding.
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The Fold
Patent history, taxonomies, why Brompton's won.
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Riding the City on a Folder
Multimodal transport, regulation, urban design.
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Designed to Disappear
Synthesis — a folder is the only bike that lives in your kitchen.