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2019 Cannondale

F-Si Throwback Framesets and Lefty Fork

A 29″ carbon frame hardtail crosscountry frameset.

Manufacturer Price

$4,500
FrameCarbon
SuspensionHardtail
ForkCannondale Lefty Ocho Carbon
Wheels29″
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Reviews

Summary

The Cannondale F-Si is a high-performance cross-country bike praised for its lightweight carbon frame, efficient power transfer, and responsive handling. The updated Lefty Ocho fork offers precise steering and forgiveness in technical sections, though it may feel harsh at lower speeds. While the bike excels in racing and technical terrain, its high price and proprietary components are notable drawbacks.

Pros
  • Lightweight carbon frame for efficient power transfer

  • Updated Lefty Ocho fork with precise steering

  • Responsive handling and quick sprints

  • Excellent climbing efficiency

  • Forgiving through technical sections

Cons
  • High price tag

  • Proprietary components and unique wheelset requirements

  • Fork may feel harsh at lower speeds

Key Quotes
This is a bike built for the privateer cross country or endurance racer.
Bicycling
Cannondale calls their trail-ready XC geometry OutFront, with a longer front end, slack head angle & lower trail combined with short 427mm chainstays.
Bikerumor logoBikerumor
Freakishly fast and ferociously focused XC weapon
BikeRadar logoBikeRadar
If this bike was a dog, it would be a whippet, the sort of dog that needs a coat when it’s cold, and has legs that look impossibly skinny, and doesn’t make sense at all until you see it in motion, when everything comes together in a blur of blinding speed that it’s hard not to respect.
MTBR logoMTBR

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Cycling News
Cannondale F-Si Carbon 3 review

Feb 2020 · Aaron Borrill

Fast, composed and damn-good looking, Cannondale's F-Si Carbon 3 proves the hardtail concept is anything but dead

Highs
  • Stealthy aesthetics

  • Impressive ride quality

  • Telepathic handling dynamics

  • Decent spec level

Lows
  • Could be lighter

Read Review

BikeRadar
Cannondale F-Si Hi-Mod World Cup review

Jan 2019 · Guy Kesteven

Uniquely-forked, arse-kicking ultralight XC racer but not for the faint-hearted or under-financed. Buy if you want a fast and ferocious XC racer

Highs
  • Unique fork and wishlist kit spec make it a real head turner, seriously light yet stiff enough to track hard, well-controlled but lightweight fork, nicely balanced between max power delivery and reasonable punishment

Lows
  • Unique features can create spares issues, high cost goes with the territory, not the lightest frame, fork or off-the-peg bike

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Bicycling
The Cannondale F-Si Carbon 2 Is a Privateer Racer's Dream

Nov 2018 · Steve Solt

This carbon hardtail is light, sharp, and features the distinctive Lefty Ocho fork

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Mountain Bike Action
Cannondale Introduces the New F-Si and Lefty Ocho

Oct 2018 · McCoy

A new generation of Lefty is here

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Bikerumor
First Rides: Cannondale F-Si hardtail & Lefty Ocho fork on a World Cup XC course

May 2018 · Cory Benson

Before the World Cup XC racing in Albstadt, we put in some first rides on Cannondale's next gen carbon XC hardtail & its all-new single crown Lefty fork. Built as an ultimate hardtail for steep & technically challenging modern courses, we turned some hot laps on the World Cup track, riding with the bike's design team.

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MTBR
Cannondale F-Si hardtail and Lefty Ocho fork launched

May 2018 · Mtbr

When the Cannondale Factory Racing Team saddles up for the XC World Cup in Germany, this weekend they’ll have two new aces up their sleeves: the new F-Si hardtail and Lefty Ocho XC fork. - Mtbr.com

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Canadian Cycling Magazine
Pro Bike: Raphaël Gagné's Cannondale F-SI Black Inc.

Apr 2016 · Philippe Tremblay

Have a close-up look at Gagné's Cannondale Lefty he was on at Sea Otter.

Read Review

Geometry
Specs
Build
Frame

ALL-NEW F-Si, Hi-MOD BallisTec Carbon, SAVE, PF30A, tapered head tube, Speed Release 12mm thru axle, Ai Offset

BB StandardPF30a, Press Fit

Fork

ALL-NEW Lefty Ocho Carbon, 29", 100mm, Chamber Damper with cable lockout, OppO Spring System, tapered steerer, 55mm offset

Bottom Bracket

PF30a, press-fit

Headset

Integrated, 1-1/8 to 1.5", sealed angular contact bearings (Integrated steer stop size small only)

Rider Notes
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First added June 25

Last updated June 25

Not listed for 2,536 days