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Precision Engineering

South San Francisco Engineered

Six Cycles LLC designs and builds high-durability urban bicycles and custom frames. We combine precision mechanical engineering with clean, functional design for low-maintenance machines.

Our Method

Precision Fabrication Phases

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Strain Simulation

TIG Welding

Alignment Verification

Road Testing

Every frame design undergoes rigorous digital strain analysis to predict real-world durability and fatigue performance.

Our expert welders perform precise TIG welds on aerospace-grade alloy, ensuring structural integrity and a clean finish.

Each completed bicycle is subjected to real-world Bay Area terrain tests to validate performance and reliability.

Frames are checked on a custom jig for perfect alignment to strict tolerances, guaranteeing a true ride.

Our Commitment

Built to last, not to replace.

We focus on zero-compromise mechanical simplicity, using durable industrial components that are field-serviceable. Our frames are designed to withstand rigorous everyday mileage, replacing disposable consumer hardware with resilient machines.

Contact Engineering

Schedule a Workshop Visit

Connect with our engineers for custom fleet builds, component hardware consultations, or a guided studio tour at our South San Francisco HQ.