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Kestrel 4000 105 Complete Tri Bike - 2016


Item # KST0004

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  • Satin Carbon/Black, 50cm ($2,849.00)
  • Satin Carbon/Black, 52.5cm ($2,849.00)
  • Satin Carbon/Black, 55cm ($2,849.00)
  • Satin Carbon/Black, 57.5cm ($2,849.00)
  • Satin Carbon/Black, 59.5cm ($2,849.00)
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Item # KST0004

Transition to speed.

With lines embodying the sweeping dive of a falcon, Kestrel has been a staple at triathlon events around the world since the original 4000 took the discipline by storm as the first full carbon TT bike in 1987. Almost 30 years later, the Kestrel 4000 105 Complete Tri Bike continues Kestrel's storied tradition by delivering wind-tunnel tested speed and long-mile comfort. Finished with a mix of Oval Concepts and Shimano 105 componentry, this whip is chomping at the bit to race at a price that pales in comparison to many other time-trial specific options.

This latest version of the 4000 is constructed out of super stiff and lightweight 800K high modulus carbon fiber for snappy handling and excellent power transfer. During the molding process, Kestrel utilizes polyurethane molding inside the bottom bracket, head tube, and other high-stress areas to minimize carbon wrinkles — a process that Kestrel claims optimizes strength while minimizing weight. Each 4000 utilizes size-specific tube dimensions, shapes, and layup to preserve consistent ride quality across the range of frame sizes.

To increase comfort over long bike segments, the 4000 boasts a slightly longer head tube than a stem-slammed, sprint-focused rig, allowing for more upright and comfortable positioning options, which should lead to less fatigue when dismounting to embark in T2. Out back, the rear triangle has been reworked to increase clearance for compatibility with the shifting trends towards wider rims, all without impacting aerodynamics. As a final touch, vertical dropouts make for fast and easy wheel changes and offer 8mm of adjustability to fine-tune your fit.

Tech Specs

Frame Material:
Kestrel Super Light 800K high modulus carbon fiber
KSL Pro SL TT Full Carbon
Fork Material:
carbon fiber
1-1/8 - 1-1/4 in FSA CX Integrated w/ 10mm top cover and cable guide
Microshift BS-A11 bar end, 11-speed
Front Derailleur:
Shimano 105 braze-on
Rear Derailleur:
Shimano 105 11-speed
50 / 34 t Oval Concepts 520
Bottom Bracket:
Oval Concepts Integrated, external bearings w/ BB30 adapter
11 - 28 t Shimano 105 11-speed
KMC X11 w/ MissingLink 11-speed
TRP 920 Forged Aero Center Pull, [levers] Oval Concepts 701
Brake Type:
[base bar] Oval Concepts 750 6061 Aluminum, [clip on] Oval Concepts 750 6061 Aluminum
Bar Tape:
Prologo Plaintouch cork
Oval Concepts 313 6061 3D-forged Alloy, 31.8mm +/- 7deg
Prologo Nago Evo Tri40, T2.0 rails
Kestrel EMS Pro w/ Ritchey clamp system
Oval Concepts 527
cartridge bearing
Vittoria Zaffiro Pro Slick, folding
Tire Size:
700 c x 23 mm
Recommended Use:
Manufacturer Warranty:
limited lifetime on frame

sizing chart

Bike size by rider height


Geometry chart


Geometry Chart



Seat Tube


Effective Top Tube






Stand Over

Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop




50cm 53.5cm 52cm 52.5cm 39.4cm 74.9cm 11.5cm 72.8o 76.5o 70mm 40cm 97.6cm 80mm 170mm
52.5cm 56cm 53.5cm 53cm 40.3cm 76.3cm 12cm 73o 76o 70mm 40cm 98.4cm 90mm 172.5mm
55cm 58.5cm 55.2cm 53.6cm 41.8cm 77.7cm 12.5cm 73.3o 76o 70mm 40cm 99.9cm 90mm 172.5mm
57.5cm 61cm 57.5cm 54.1cm 44cm 79.3cm 13cm 73.3o 76o 70mm 40.5cm 102.8cm 100mm 175mm
59.5cm 63cm 58.6cm 54.7cm 45cm 79.8cm 13.5cm 73.5o 76o 70mm 40.5cm 103.7cm 100mm 175mm

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Excellent value

  • Familiarity: I've used it once or twice and have initial impressions

Triathlon is an equipment heavy sport. It makes sense then to get a good deal when you can. Kestral's line up can help help you save some $$ while still providing a quick and comfortable bike. The 4000 105 represents and incredible value. Hit me up and we can go over the details of getting you into T2 ahead of the pack. btowery@backcountry.com 801-204-4557