Back to Bike FinderYears: 1957 · 1956 · 1955 · 1954
DKW RT 125 2H
1955Sportbike

DKW RT 125 2H

Key specifications

Engine
123 cc
Power
6 HP
Fuel type
petrol
Transmission
3-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1955 DKW RT 125 2H, a quintessential representative of post-war European motorcycling that perfectly encapsulates the spirit of the era. As a sport category motorcycle, the RT 125 2H was designed to cater to the burgeoning demand for lightweight, nimble machines that offered both performance and practicality. Its sleek profile and retro charm have made it a beloved classic among motorcycle enthusiasts and collectors alike, standing out in the crowded landscape of 1950s motorcycles. With its rich heritage and innovative engineering, the DKW RT 125 2H continues to captivate riders who appreciate the blend of simplicity and performance. At the heart of the RT 125 2H lies a peppy 123cc single-cylinder, two-stroke engine that produces a spirited 5.7 horsepower at 5,000 RPM. This modest power output is paired with a lightweight frame, allowing the motorcycle to reach an exhilarating top speed of 84 km/h (52.2 mph). With a compression ratio of 6.5:1 and a bore and stroke of 52.0 mm by 58.0 mm, the engine delivers a punchy performance that is perfect for both urban commuting and spirited rides on winding roads. The three-speed gearbox, coupled with a wet multiplate clutch, ensures smooth and responsive gear changes, while the air-cooling system keeps the engine running efficiently even during extended rides. The DKW RT 125 2H boasts several key features that underscore its engineering prowess, including a single cradle frame that provides stability and strength without adding unnecessary weight. The front suspension employs a telescopic fork setup, which enhances comfort and handling, while the rear drum brake system ensures reliable stopping power. Weighing in at just 1,959 mm in length and 660 mm in both width and height, the RT 125 2H is a compact machine that is easy to maneuver, making it an ideal choice for both novice riders and seasoned enthusiasts. The kickstarter adds a touch of nostalgia, encapsulating the essence of mid-century motorcycling. **

Pros

  • Lightweight and Agile: Its compact design and low weight make it exceptionally maneuverable, perfect for city riding and tight corners.
  • Historic Appeal: With its classic design and two-stroke engine, the RT 125 2H offers a nostalgic riding experience that resonates with vintage motorcycle collectors.
  • Simplicity of Maintenance: The straightforward engineering and minimalistic design mean that maintenance is relatively easy, making it suitable for DIY enthusiasts.

Cons

  • Limited Power Output: The engine’s modest horsepower may not satisfy those seeking high-performance thrills, particularly on highways.
  • Basic Suspension System: The absence of rear suspension can lead to a less comfortable ride on rough terrains compared to modern motorcycles.
  • Manual Kickstart: The kickstarter might be a charming feature for enthusiasts, but it can be less convenient than electric starters for everyday use.

Technical details

Source specification data

Make
DKW
Model
RT 125 2H
Category
Sport
Starter
Kick
Power
5.70 HP (4.2 kW)) @ 5000 RPM
Clutch
Wet multiplate
Gearbox
3-speed
Ignition
Magneto
Top Speed
84.0 km/h (52.2 mph)
Fuel System
Carburettor
Bore X Stroke
52.0 x 58.0 mm (2.0 x 2.3 inches)
Compression
6.5:1
Displacement
123.00 ccm (7.51 cubic inches)
Cooling System
Air
Engine Details
Single cylinder, two-stroke
Transmission Type Final Drive
Chain
Overall Width
660 mm (26.0 inches)
Overall Height
660 mm (26.0 inches)
Overall Length
1,959 mm (77.1 inches)
Seat
Dual
Wheels
Spoked
Rear Tyre
2.50-19
Frame Type
Single cradle
Front Tyre
2.50-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
None
Front Suspension
Telescopic fork