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2019 Cannondale

F-Si Carbon 3

A 29″ carbon frame hardtail crosscountry bike with high-end components.
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Manufacturer Price

$3,675
Weight22.3 lbs  
FrameCarbon
SuspensionHardtail, 100mm
ForkCannondale Lefty Ocho
Wheels29″ Aluminum
Drivetrain1 × 12
GroupsetGX Eagle, Truvativ Stylo
BrakesSRAM Level T Hydraulic Disc
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
F-Si Carbon 3
Other Crosscountry bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

27 mph

F-Si Carbon 3

27 mph

Similar Bikes

Highest gear

(descending)

Sizing
XS

5'1" – 5'6"

SM

5'4" – 5'9"

MD

5'7" – 6'0"

LG

5'10" – 6'3"

XL

6'0" – 6'5"

🐐 Estimated

Rider Fit Notes

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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

Mountain Bike Action
MBA Bike Test: Cannondale F-Si Carbon 3

Dec 2019 · McCoy

A sleek, race-ready cross-country weapon

Read Review

MTBR
Review: Cannondale F-Si Throwback

Oct 2019 · James Stout

- Mtbr.com

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

Read Review

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

Read Review

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.

Read Review

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, BallisTec Carbon, SAVE, PF30A, tapered head tube, Speed Release 12mm thru axle, Ai Offset

BB StandardPF30, Press Fit

Fork

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

Travel100mm

Shock

N/A

Bottom Bracket

Cannondale Alloy PressFit30

Headset

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

Stem

Cannondale C3, 3D Forged 6061 Alloy, 1-1/8", 31.8, 7°

Handlebar

Cannondale C2 Flat, butted 2014 Alloy, 8° sweep, 760mm

Saddle

Fabric Scoop Flat Elite, cro-mo rails

Seatpost

Cannondale C2, Carbon, 27.2 x 400mm

TypeRigid

Pedals

Not Included

Grips

Cannondale Locking Grips

Groupset
Rear Derailleur

SRAM GX Eagle

Crank

Truvativ Stylo 6K, 34T, Ai Custom

Shifters

SRAM GX Eagle, 12-speed

Cassette

SRAM PG-1230, NX Eagle, 11-50, 12-speed

Chain

SRAM GX Eagle, 12-speed

Chain Guide

N/A

Brakes

SRAM Level T hydro disc, 160/160mm Centerline rotors

TypeSRAM Level T Hydraulic Disc

Brake Levers

SRAM Level T hydro disc

Wheels
Rims

Stan's NoTubes Crest MK3, 28h, tubeless ready

Spokes

DT Swiss Competition (Ai Offset dish - rear)

Front Hub

Stan's NoTubes Neo Lefty front, Neo 12x148 rear w/HG driver

Rear Hub

Stan's NoTubes Neo Lefty front, Neo 12x148 rear w/HG driver

Tires

Schwalbe Racing Ray Performance 29 x 2.25" front, Racing Ralph Performance 2.25" rear, Addix Compound, tubeless ready

Rider Notes
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First added March 17

Last updated June 9

Not listed for 2,204 days