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2018 Cannondale

F-Si Carbon 5

A 29″ carbon frame hardtail crosscountry bike with upper mid-range components.
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Manufacturer Price

$2,199
FrameCarbon
SuspensionHardtail, 100mm
ForkRockShox Reba
Wheels29″ Aluminum
Drivetrain1 × 11
GroupsetXT, SLX
BrakesShimano Deore Hydraulic Disc
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Insights
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)

25 mph

F-Si Carbon 5

27 mph

Similar Bikes

Highest gear

(descending)

Sizing
SM

5'2" – 5'8"

MD

5'6" – 5'11"

LG

5'10" – 6'3"

XL

6'1" – 6'7"

🐐 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 climbing, and responsive handling. The updated Lefty Ocho fork offers precise steering and smooth suspension, making it a standout for technical sections and descents. While it excels in race-ready performance, the absence of a dropper post and the high price tag are noted drawbacks.

Pros
  • Lightweight carbon frame

  • Efficient climbing and power delivery

  • Responsive and precise handling

  • Smooth suspension performance with Lefty Ocho fork

  • Good clearance for wider tires

Cons
  • High price tag

  • No dropper post included

  • Fork may feel harsh at lower speeds

Key Quotes
This is a bike built for the privateer cross country or endurance racer.
Bicycling
All in all it seems like the F-Si + Lefty Ocho combo can double as a proper pro-level race hardtail and a lightweight, competent singletrack trail bike as well.
Bikerumor logoBikerumor
It’s just pure, smooth suspension action, for superb control
MTBR logoMTBR

Feedback?

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

Dec 2019 · McCoy

A sleek, race-ready cross-country weapon

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.

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Canadian Cycling Magazine
Trail Test: The Cannondale F-Si Carbon 2, an entry model with top specs for tearing up the XC course

Oct 2015 · Canadian Cycling Magazine

A brand’s base model of a bike line usually shows cost-saving choices throughout its spec. Often the frame material and production process are altered as well.

Read Review

Velo
Pro Bike Gallery: Keegan Swenson’s Cannondale F-Si Carbon Team

Jun 2015 · Logan VonBokel

The reigning U23 cross-country national champion's ride is chock-full of ENVE carbon, Cannondale tech, and American livery.

Read Review

MTBR
Pro Bike: Marco Fontana’s Cannondale F-Si Carbon Team

Mar 2015 · Kristen Gross

Lightweight racer of Italian national XC champ and Olympic bronze medalist spec'd with SRAM XX1 drivetrain, ENVE wheels, and Prologo saddle and grips. - Mtbr.com

Read Review

Geometry
Specs
Build
Frame

F-Si, BallisTec Carbon, SAVE, PF30A, 1.5 Si Head Tube, Ai Offset, 27.5" (S), 29" (M-XL)

BB StandardPF30, Press Fit

Fork

RockShox Reba RL, 100mm, Solo Air, Tapered Steerer, Maxle Lite, 51mm offset

Travel100mm

Spring TypeAir

Bottom Bracket

Cannondale Alloy PressFit30

Headset

Cannondale HeadShok Si

Stem

Cannondale C3, 6061 Alloy, 1.5", 31.8, -5°.

Handlebar

Cannondale C3 flat, 6061 double-butted Alloy, 760mm

Saddle

Cannondale Stage 3

Seatpost

Cannondale C3, 6061 alloy, 27.2x350mm (S,M) 400mm (L,X)

TypeRigid

Pedals

Not included

Grips

Cannondale Locking Grips

Groupset
Rear Derailleur

Shimano XT, 11-speed Shadow Plus

Crank

Cannondale Si, BB30 w/ Ai SpideRing, X-Sync®, 32t

Shifters

Shimano SLX, 11-speed

Cassette

SunRace, 11-46, 11-speed

Chain

KMC X11, 11-speed

Brakes

Shimano Deore MT-500 hydro disc, 180/160mm (S-160/160mm)

TypeShimano Deore Hydraulic Disc

Brake Levers

Shimano Deore MT-500 hydro disc

Wheels
Rims

WTB STP i19 Tubeless Ready

Spokes

DT Swiss Competition (Ai Offset dish - Rear)

Front Hub

Formula DC51 front, Formula DC-1422 (Ai Offset dish - Rear), QR

Rear Hub

Formula DC51 front, Formula DC-1422 (Ai Offset dish - Rear), QR

Tires

Schwalbe Racing Ralph Performance 29/27.5x2.25"

Rider Notes
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First added February 20

Last updated February 20

Not listed for 3,020 days