A pure-street-racer bike loved by riders all over the world.

A light and supple riding feeling makes you forget that it is a mini-velo.

Frameset weight of 2.2 kg (including fork) is the lightest in Tyrell’s product line. The front part of the frame is made of AL7005 aluminum alloy, and the rear part is a hybrid frame made of carbon. By exchanging attachments, it’s possible to use both mechanical and electronic transmission components.The combination of the rigid front frame and the flexible carbon rear frame and front fork responds lightly to pedal input, giving you a feeling of flying.

In contrast to the unique PK1, which has a strong sense of acceleration, it can be said to be a “total balanced CSi” with light, supple and well-balanced riding performance.

  • Please note in advance that some designs and specifications may differ from those shown in the images due to production timing and other factors.
Size of Wheels
Material of Frame


Di2 attachment

An attachment-type cover is used to house the battery and the wiring inside the frame when using an electronic transmission component. Both mechanical and electric components are available.

Full carbon fork

Adopted a lightweight full carbon fork made of carbon up to the column shaft, that greatly contributes to smooth riding.

Beautiful welded finish

Smooth welding with inconspicuous weld beads is further polished by hand to achieve a smooth and beautiful frame silhouette.


Equipped with high-performance wheels “AM-6 451” that combine wide rims with Tyrell hubs having high rotational performance. Even with low air pressure, wide rims offer low rolling resistance and a firm feeling in corners.


Tyrell’s unique frame design “Slant Design Technology”.

A framework that achieves both ride comfort and high performance by exhibiting high rigidity in the horizontal and torsional directions, but not excessively high rigidity in the vertical direction, by forming a number of triangles.

  • Image may differ from the color of the current model.


  • A Wheel Base: 1,034 mm
  • B Seat Tube length (C-T): 405 mm
  • C Virtual Top Tube length (Horizontal): 545 mm
  • D Head Tube angle: 71.0°
  • E Seat Tube angle: 73.5°
  • F Chainstay length: 425 mm
  • G Bottom Bracket height: 272 mm
  • H Full length: 1,545 mm


Name: CSI

Complete bike ‹Drop Bar Model› SHIMANO 105 R7000 2x11s
Complete bike ‹Flat Bar Model› SHIMANO Tiagra 4700 2x10s
Weight 8.6 kg ‹SHIMANO 105 R7000 2x11s, Drop Bar Model, not including wieht of pedal›
Colors Gray metallic & Orange, Kurogane Matt Black
Manufacturing and Inspection We do everything from welding to heat treatment of frames in Taiwan. Final finishing of frames, precision control, assembly, and final inspection are performed at our own factory.
  • For available components, framesets, specification changes and prices, please see ‹Specifications and Pricing [PDF]›.

[Note: Images, specifications and prices on the website]

Specifications and prices of this product are subject to change without notice. Also, specifications and prices of the current model may differ from the images shown. For details, please check the latest specifications and price list or contact us.