Tyrell CSI


The CSI delivers High Performance and is Super Light Weight.

This all purpose mini-velo features carbon seat stay, carbon chain stay and a 20” 451 carbon monocoque fork

Fixed Frame


Slant Design

CSI is designed by weaving together a distinctive thin large diameter aluminium frame and beautiful carbon rear triangle.

A utility bike endorsed by riders due to its performance and sharpness because of its super lightweight body and specifications. The frame design has a common design code which is the “slant design” adopting the two narrow inclined pipes sandwiching the top tube. The silhouette of the impressive frame design not only lies in the design, but also on the unique minivelo framework that will contribute to increase the strength of the entire frame as well as the rigidity around the long head tube. High torsional rigidity due to this slant effect and low center of gravity because of the geometry plus using the strongest yet lightweight #7005 aluminium alloy series and pair it with a rear carbon triangle will create an explosive acceleration feeling and sharp handling which road bike’s cannot give. The CSI is compatible to install the Shimano Di2 electronic drive train. It’s smooth, beautiful welding and attention to detail is the perfect one for those who pursues real fun.

Attractive Frame Design

“Slant Tube” is when two tubes extending from the head tube to the top tube creates an exceptional beauty when viewed from the back. Furthermore, the unique shape down tube enhances the rigidity which is the uniqueness of the CSI.

Craftsmanship Detailing

The smooth welding on the aluminium 7005 frame for light weight and high rigidness requires the welding beads to be carefully polished. This attention to the smallest details is to ensure the CSI is beautifully and skilfully done.

The New Carbon Rear Triangle

Using carbon material for high vibration absorbing purposes on the chain and seat stay, also adds to the beauty of the CSI.


Around the BB Design

Three places around the bottom bracket are welded to increase the frame strength. The Chainstay which is fixed by a special adhesive, brings out a tremendous rigid feeling beyond imagination.



Frame #7005 Double Butted TIG & Smooth Welding
Fork 3K Carbon Monocoque
Wheels AM-9 (451) Aero Spokes
Tires Schwalbe Durano 20″ x 1.1
Front Derailleur Shimano Ultegra 6800 (22 Speed)
Rear Derailleur Shimano Ultegra 6800 (22 Speed)
Shifter Shimano Ultegra 6800 (22 Speed)
Cassette Shimano Ultegra 6800 11-25T (22 Speed)
Chain KMC X11L
Crankset Shimano Ultegra 6800 (22 Speed)
Brake Caliper Shimano Ultegra 6800 (22 Speed)
Saddle Prologo NAGI EVO T1.4
Seatpost #7075 Alloy, D31.6x400mm
Stem Tyrell Road Stem 31.8 100mm
Handlebar Tyrell #7050 D31.8 42cm
Pedal Wellgo C139

Disclaimer : Bicycle specifications may vary without notice in different territories and from time to time. Always check specifications with your retailer.


The main frame is made from aluminium 7005 material and using full carbon rear triangle, create a light weight with super vibration absorption minivelo that is performance ready.

Main features:

  • Lightweight Hybrid 7005 Aluminum Frame & Carbon Rear Triangle
  • Frame design compatible to fit all road drive trains
  • Craftsmanship in the detailed welding finish and top of with Kadowaki powder coating
  • Ideal frame for both light weight and high rigidity
  • Unique shaped down tube to increase rigidity
  • Full carbon monocoque fork that promises lightweight and ride comfort
  • High-performance AM3 wheels with sealed bearing hub
  • Di2 ready with internal wiring
  • Low center of gravity and long wheel base for stable riding
  • A wide range of specifications are available according to the riding style, from handlebar types to different drive train settings
The Lightness

High torsional rigidity by the slant tube with low center of gravity and long wheel base allows you to enjoy a sense of stability on the CSI.
In addition, by pairing the rigid aluminium frame with the flexibility of carbon to create a light weight frame makes acceleration on the CSI a truly enjoyable feeling.

Lightweight Full Carbon Monocoque Fork

A lightweight full carbon monocoque fork which is excellent for vibration absorption is used for delivering a light and comfortable ride.

High-Performance AM-3 Wheels

Lightweight, high-performance wheel with sealed bearing hub (AM-3) on the 20 inch 451 size delivers excellent rotation performance and unique riding experience.In addition, you can opt to upgrade to a higher grade wheels, the AM – 9 Plus which churns out even better riding performance.”

Equipped with High End Shimano Components

The standard CSI is equipped with high-grade Shimano Ultegra R8000 series, which is smooth, reliable and robust to compliment the CSI.


Custom Specification:

It is possible to select one of your favourite specifications from a wide range of choices according to budget and riding style. This includes handlebar type and and your preferred drive trains. The CSI is compatible with all the latest drive trains, so it is possible to just purchase the frame and custom build the CSI with parts of your choice.

Credit: Photo and text from Tyrell Japan.

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