The Brand

---

1926 Cotton–Blackburne 348cc

Model 29 TT

In 1926, Cotton achieved one of the most extraordinary moments in British motorcycle history. The Cotton–Blackburne 348cc Model 29 TT was the machine that helped secure 1st, 2nd, and 3rd place in the Lightweight TT at the Isle of Man, a feat that firmly established Cotton as a racing marque of international significance.

As we mark the centenary in 2026, this machine stands not only as a motorcycle, but as a symbol of engineering conviction.

Powered by a 348cc Blackburne overhead-valve engine (350cc class), the Model 29 TT combined strong mid-range torque with exceptional mechanical reliability. What truly distinguished it, however, was the patented Cotton triangulated frame. At a time when most manufacturers relied on modified bicycle “diamond” frames, 

Cotton’s rigid triangulated construction delivered:

- Superior torsional stiffness
- Precise steering control
- Reduced flex under racing stress
-  Improved rider confidence at speed
 

This design philosophy gave Cotton an edge where it mattered most: cornering stability and road holding.

The 1926 Lightweight TT became historic:

 1st Place
 2nd Place
 3rd Place
 

No other manufacturer achieved such dominance in that class that year.

It was proof that Cotton’s frame concept was not theory , it was competitive reality.

Engine: 348cc Blackburne OHV (350cc racing class)

Carburation: Period racing specification 

Transmission: Hand-change gearbox

Frame: Fully triangulated Cotton patent design

Front Suspension: Girder forks

Rear: Rigid frame with sprung saddle
 

Lightweight, direct, mechanically honest the Model 29 TT was built for one purpose: to win.

In 2026, we celebrate 100 years since this defining victory.

What makes the Model 29 TT so important today?

Cotton focused on frame geometry when others focused only on engine power.

The 1926 victory positioned Cotton among Britain’s serious racing marques.

Performance through intelligent design, a philosophy that still resonates today.

• The triangulated frame concept was originally inspired by F.W. Cotton’s experience in hill climbs before WWI.
• Many rival manufacturers initially dismissed the frame as unconventional. until it began winning.
• Surviving Model 29 TT machines are extremely rare and highly sought after by collectors. 
• The 348cc engine was officially classified in the 350cc category, a common practice of the era.
   

The 1926 Cotton–Blackburne 348cc Model 29 TT represents more than a competition motorcycle. It represents a moment when innovation challenged convention and won.

As we commemorate its centenary in 2026, we honour not only a race victory, but the spirit of engineering independence that defined Cotton from the beginning.