Moulton Suspension
Moulton suspension is fundamental to the performance, comfort and efficiency of every Moulton bicycle. Drawing on Dr Alex Moulton’s pioneering work in automotive suspension design, each system is engineered to isolate road shock, maintain traction and reduce fatigue - delivering a uniquely smooth and efficient ride without compromising speed or precision.
Rear Suspension
Moulton rear suspension works in harmony with the front system to maintain traction, reduce fatigue and improve efficiency on real roads. Using either the fluid-damped Hydrolastic® unit or the maintenance-free Monosphere dry-cone system, the rear wheel moves independently of the main frame, storing and controlling bump energy rather than transmitting it directly to the rider. The result is smooth, stable and efficient progress across varied surfaces.
Front Suspension
Moulton front suspension isolates the front wheel from road shock while preserving precise steering control. By allowing the wheel to move vertically over imperfections, vibration is absorbed before it reaches the rider. Depending on model, this is achieved through either the friction-free Flexitor® system or the highly adjustable Leading Link design - both engineered to maintain comfort, traction and efficiency without compromising handling.
Pivot Bearings
The rear fork and pivot assembly form the structural heart of Moulton suspension performance. Most current models feature a unified rear fork, where the bottom bracket is attached directly to the rear triangle to isolate pedalling forces from suspension movement. Durable bronze bushes, stainless-steel journals and, in some models, sealed pivots ensure precise movement, long-term durability and consistent ride quality.
The Principles Behind the Ride
Suspension has been central to the Moulton philosophy since the very beginning. Long before most bicycle designers considered suspension viable for fast road riding, Dr Alex Moulton had already proven its value in the automotive world.
In the 1950s and 60s, Alex Moulton developed the fluid-interconnected Hydrolastic suspension system for BMC, famously fitted to the Austin and Morris Mini and eventually to over four million cars. His work revolutionised small car ride quality, demonstrating that properly controlled suspension could deliver comfort, efficiency and superior road holding simultaneously.
When he turned his attention to the bicycle, the challenge was different: how to combine small, fast-rolling wheels with high-pressure tyres - without sacrificing efficiency or comfort. His solution was not softer tyres or flexible frames, but lightweight, short-travel suspension systems, tuned specifically for road use.
The principle is simple but powerful:
On an unsuspended bicycle, the whole machine and rider must rise over every bump.
On a suspended Moulton, only the wheels move vertically.
The suspension stores and controls bump energy rather than passing it directly to the rider.
The result is greater comfort, improved traction, reduced fatigue and - crucially - increased efficiency on real-world roads. Properly engineered suspension slows the bicycle less over imperfect surfaces, keeps the tyres in contact with the road and reduces vibration transmitted to the rider.
Unlike long-travel off-road systems, Moulton suspension is honed specifically for high-performance road cycling: light, efficient and remarkably low maintenance.
Monosphere
The Monosphere is a “dry” rubber cone system that operates without hydraulic fluid.
The hollow rubber cone works in both compression and shear, producing a smoothly rising spring rate. Damping is provided naturally through the hysteresis of the rubber itself, eliminating the need for a separate damper and contributing to the system’s mechanical simplicity.
This inherently straightforward design makes the Monosphere exceptionally durable and effectively maintenance-free. If required, spring rate can be increased by approximately 10% through the use of an alternative cam plate, without reducing suspension travel. The principle closely mirrors the rubber cone suspension used in millions of BMC Mini cars from 1959 to 2000 - a proven concept refined for high-performance cycling.
Hydrolastic®
Hydrolastic suspension directly reflects Alex Moulton’s automotive heritage.
This system uses a rubber cone spring combined with internal fluid damping. As the cone compresses, Hydrolastic fluid passes through a precision valve to a secondary chamber, providing controlled damping in addition to the natural characteristics of the rubber. An internal air chamber pressurises the fluid to ensure consistent performance and responsiveness.
The entire unit is self-contained and engineered for durability, delivering controlled, fluid-damped response, a smooth progressive spring rate and increased stability under load - all without requiring lubrication.
Leading Link
The Leading Link system is a highly adjustable and mechanically robust solution, offering precise steering control and tuneable suspension performance.
A floating fork stirrup mounted ahead of the fork crown pivots on stainless steel leading links, providing accurate steering guidance with minimal friction.
A coil spring housed within the steering column delivers the primary suspension support, with different spring rates specified according to riding intention - firmer for speed or competition, and more compliant for comfort-focused use. Ride height and damping are adjustable, allowing the system to be tuned to rider weight and preference. The result is a front end that combines road-smoothing compliance with confident, accurate steering.
Flexitor®
The Flexitor system represents one of the most elegant expressions of Moulton engineering.
Rather than relying on conventional pivots and bearings, Flexitor uses rubber elements working in torsional shear to provide location, springing and damping within a single unit. With no sliding surfaces, there is virtually no static friction in the system, allowing the fork to respond instantly to even the smallest road irregularities. Because there are no pivots to wear or seize, the design is inherently durable and effectively maintenance-free over the long term.
Flexitor forks incorporate adjustable bump-stop and rebound-stop settings, along with a “soft-lockout” mechanism that reduces travel during climbing or sprinting while still preserving shock absorption. The progressive behaviour of the rubber - through its natural hysteresis - ensures smooth control without the need for additional lubrication or complex servicing, keeping the system clean, self-contained and reliable.
From refined performance models to versatile everyday machines, each Moulton bike combines comfort, efficiency and precision engineering for riding in town, country and beyond. Designed and hand-built in Britain, every bike offers a uniquely smooth, lively ride, built around a distinctive small-wheel, suspended design philosophy.
