Cotton, The Motorcycle Masterpiece ®

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By 1931, Cotton offered a broad and technically sophisticated range of motorcycles, powered by leading proprietary engines including JAP, Rudge Python, Blackburne, and Sturmey-Archer. 

All models were built around the marque’s distinctive fully triangulated frame, which remained central to its handling superiority.

 The 1931 range demonstrates Cotton’s commitment to offering multiple engine options across similar capacities, allowing riders to choose according to performance preference and manufacturer reputation. Despite engine variation, the defining feature across the range remained the rigid and lightweight triangulated frame, which continued to distinguish Cotton from many competitors.

 The Model 25/J represented a high-capacity option within the JAP-powered range. Its 499cc engine delivered substantial power, making it suitable for fast touring and competitive events. The combination of large displacement and Cotton’s advanced chassis resulted in impressive road-holding and stability at speed. 

 The Model 29/J featured a 345cc JAP engine, providing stronger torque and improved flexibility over the smaller-capacity models. Intended for sporting road riders, it balanced performance and control, making full use of Cotton’s rigid yet lightweight frame design. 

  The Model 29/RP was equipped with a 349cc Rudge Python four-valve engine, a sophisticated unit known for its high efficiency and performance. The four-valve design improved breathing and power output, making this model particularly attractive to sporting and racing riders seeking advanced engineering.

The Model 25/RP combined Cotton’s triangulated frame with the powerful 499cc Rudge Python four-valve engine. This configuration delivered strong high-speed performance and smooth power delivery, positioning the model among the most technically advanced machines in the Cotton range of the period.

The Model 9/OSF was powered by a 348cc Blackburne engine, offering dependable performance and refined operation. Blackburne engines were widely respected for their durability, and in combination with Cotton’s chassis, the result was a well-balanced and capable sporting motorcycle. 

The Model 29/B featured a 348cc Blackburne two-port engine, providing improved gas flow and enhanced performance over standard configurations. This model was aimed at riders seeking competitive performance with proven reliability. 

The Model 25/B was a powerful sporting motorcycle fitted with a 496cc Blackburne two-port engine. With strong torque and substantial output, it was well suited to fast road riding and competition events, while retaining the precise handling characteristics of the Cotton frame. 

The Model 25/SA was equipped with a 496cc Sturmey-Archer two-port engine, offering robust power delivery and mechanical refinement. Designed for riders demanding performance combined with engineering sophistication, it reflected Cotton’s commitment to pairing advanced engines with superior chassis design.

 By 1932, Cotton continued to offer a range of lightweight and sporting motorcycles, all built around the company’s distinctive fully triangulated frame. 

A lightweight and economical motorcycle powered by a 148cc Villiers two-stroke engine. Designed primarily for everyday transport, this model combined low running costs with Cotton’s superior chassis rigidity, offering better handling than many comparable lightweight machines.

A mid-capacity two-stroke model using a 246cc Villiers engine. It offered stronger performance while maintaining mechanical simplicity and low maintenance costs. Well suited for riders wanting extra power without sacrificing economy. 

 A sporting lightweight fitted with a 250cc JAP overhead-valve engine. Designed for agile road use and club competition, it combined responsive acceleration with Cotton’s precise chassis balance. 

 A core mid-range sporting model powered by a 350cc JAP engine. It delivered strong torque and dependable performance, benefiting from Cotton’s rigid and lightweight frame construction.

 A high-capacity sporting machine equipped with a 500cc JAP engine. Intended for experienced riders, it offered impressive power and high-speed stability. 

 Powered by a 350cc Blackburne overhead-valve engine, this model delivered smooth performance and mechanical reliability, ideal for sporting road use.