Cannondale F-Si

89/100
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Facts

Gender
Release Year
Brand
Wheel Size
Numbers of gears
Weight
Suspension
Brake Type
Frame Material

Summary of Reviews

We have read all expert and user reviews on Cannondale F-Si. In summary, this is what cyclists think.

18 reasons to buy

  • The F-Si cornered with precision at high speeds, in racing situations.
  • It was deemed ‘striking’, ‘head-turning’ and ‘uniquely good-looking’.
  • Single-tined Lefty Ocho forks weighed only 51oz and handled large hits well.
  • Climbing was considered to be fast and efficient atop the F-Si.
  • A cable-actuated fork lockout system simplifies tuning and maintenance.
  • Powerful Shimano XT brakes impressed on the F-Si 2.
  • A slack 69° head-angle and 55mm fork offset gave a planted and agile ride.
  • New 1⅛ x 1.5 tapered headtubes were now compatible with standard steerers.
  • Asymmetrical rear stays allowed stiffer, symmetrical lacing of the rear wheel.
  • Tire clearance allowed for rubber up to 2.35” in width.
  • The Schwalbe Racing Ray / Racing Ralph combo was fast and grippy.
  • An integrated seat-clamp allowed extra seatpost flex and kept lines clean.
  • Testers reported direct power transference into the F-Si’s back end.
  • SRAM’s Eagle groupset was regarded as reliable and exacting in its operation.
  • The ‘stunning’ carbon chassis design featured internal cabling.
  • A steel Eagle NX Cassette on the F-Si 5 was heavier, yet resilient.
  • Internal cable routing was readied for dropper-post connection.
  • The rear wheel’s ‘Speed-Release’ thru-axle made removal quick and easy.

7 reasons not to buy

  • Experts agreed that descents on the F-Si demanded attention and skill.
  • The ‘Ai’ system means that replacement rear wheels must be very specific.
  • Many testers and owners were keen to see a dropper-post specced on the F-Si.
  • The single-tined Lefty Ocho fork requires a front wheel with a unique hub
  • One expert said the bike came across as jouncy on rugged terrain.
  • A tester was not dazzled by SRAM Level T brakes on the F-Si 3.
  • Fork offset, wide bars and long stems led to slightly twitchy handling that suited advanced riders.

Bottom line

Not a beginner’s bike, but definitely a great option for your first race bike. Years of refinement see Cannondale’s unique technical innovations coalesce into the cross-country beast that is the F-Si. The manufacturer’s iconic Lefty fork, in this ‘Ocho’ configuration, sports superior low-friction sensitivity to small impacts due to the use of needle bearings and a progressive air shock. This sensitivity is perceived as a characteristic of the bike’s racy demeanour. Asymmetric ‘Ai’ rear stays make for a stiffer rear wheel, while an unprecedentedly slack head-angle and 55mm fork offset aims at a stable yet nimble ride. What is the upshot of all this tech banter? The F-Si is a refined, high-performance machine that might be too much for beginners, but which is a proven winner at breakneck speed in challenging conditions. Complete bikes range from around $2K to over $10K, allowing entry on a range of budgets.

Expert Reviews

83/100 based on 4 expert reviews
80
BikeRadar

Cannondale F-Si Hi-Mod World Cup Review

Level 5 expert

Uniquely-forked, arse-kicking, ultralight XC racer but not for the faint-hearted or under-financed.

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90
cyclingnews

Cannondale F-Si Carbon 3 Review

Level 2 expert

It’s difficult to dispute the stealth, almost Darth Vader-like visage of the Cannondale F-Si… Power transfer is immediate, whether you’re seated or out of the saddle… The F-Si is a lively bike…

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92.5
Solo Bici

Cannondale F-Si Hi-Mod World Cup: Next Level [Spanish]

Level 2 expert

The F-Si remains an impetuous and somewhat nervous bike in the fastest descents . It’s very light and responds vehemently to any insinuation.

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78
Fiets

Review: Cannondale F-SI Carbon 5 [Dutch]

Level 4 expert

It is good to be able to report that this stripped down version gives the same quick impression as its much more expensive brother… the wheels are a lot heavier and the fork less stiff… but this is hardly a hindrance.

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Mountain Bike Action

Cannondale F-Si Carbon 3

Level 1 expert

If you’re looking to get your first serious mountain bike, the Cannondale F-Si Carbon 3 should be vying for your attention. Road riders looking to get dirty, look no further… a serious competitive weapon.

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User Ratings

100/100 based on 3 ratings
  • 5 star
    100%
  • 4 star
    0%
  • 3 star
    0%
  • 2 star
    0%
  • 1 star
    0%

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Rankings

Compared to other bikes
#3   Best Cross Country
Top 50%
#10   Best Mountain
Top 30%
#3   Best Cannondale Bike
Top 50%
#26   Best of All Bikes
Top 30%

Comparison

In comparison to averages of categories
Cannondale F-Si
89
Average All Bikes
81
Average Cannondale Bike
85
Average Mountain Bike
81