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Cannondale 2019 F-Si Carbon 4 Mens Mountain Bike - Black

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  • Cannondale F-Si Carbon 4 Mens Mountain Bike 2019 - Black

Cannondale F-Si Carbon 4 Mens Mountain Bike 2019 - Black

Web Price £2,699.99

Quick Overview

F-Si has always been about pushing the limits of what an XC hardtail is capable of, and the new version pushes it harder and further than ever. No other hardtail descends as fast, climbs as nimbly, or kicks harder, smoother.

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F-Si has always been about pushing the limits of what an XC hardtail is capable of, and the new version pushes it harder and further than ever. No other hardtail descends as fast, climbs as nimbly, or kicks harder, smoother. With the otherworldly performance of the new Lefty Ocho, you’ve got a whole-new level of XC capability, tailor-made to feed the needs of the XC obsessed.


Lighten Up

Light weight. Not a lightweight.

At just 900 grams (size Med, with all paint and hardware), the all-new F-Si is the lightest mountain bike frame Cannondale has ever made. It shaves 80 grams off the previous F-Si, and when you factor in the svelte new Lefty Ocho, you save a whopping 330 grams on the frame and fork (that's around 3/4 of a pound for you imperial folks). Pretty impressive.


What’s even more impressive is that, rather than chasing marketing grams, our engineers focused on features that deliver real performance benefits out on the course. Features like Ai and OutFront, or improved compliance, or improved durability. That’s what wins races, not saving the weight of a few sips of water. Lighten up right, with the all-new F-Si.


Lefty Ocho OutFront

The all-new Lefty Ocho is the smoothest, stiffest ultra-light XC fork ever made. It floats through chop and steers through the choss like nothing else.


Silky smooth and unfazed no matter how hard you push it. Happy to get in as deep as you dare. Its extra-long fork offset pairs up with the F-Si’s new, slacker 69° head angle to create OutFront geometry, giving you extra stability to charge the downs, with full XC agility on the ups. Helping the F-Si track perfectly through whatever you throw it into.


Ai Party in the Back

Short chainstays do wonders for traction and nimble handling, but they usually come at a cost. Ya gotta give something to get something. Not so with Ai.


Ai is our proprietary Asymmetric Integration drivetrain offset. By moving the gears and rear triangle over, we create space (double what you get from Boost) that enables us to shorten the stays AND still have clearance for big tires and room for 2x drivetrains if you want. It even creates a stiffer, stronger rear wheel by evening out the dish. Smart, right?


BallisTec Carbon

Our proprietary ballistec carbon lets us push boundaries and tune rigidity throughout the entire frame – for stiffness where you need it and compliance where you don’t. At just 900 grams (size M, with all paint and hardware) it's one of the lightest hardtails in the world, yet so durable we back it with a lifetime warranty.


SAVE Micro-Suspension

SAVE micro-suspension tunes the overall compliance of the frame. The rear triangle flexes vertically for shock absorption. Directionally optimised carbon layup in the seat tube allows controlled fore/aft bowing, for better traction, higher speeds and drastically minimised fatigue, whether seated or standing. Go faster longer.


Hidden Seatpost Collar

For seated comfort, designing the F-Si with a 27.2mm seat post was just the start. Our collarless seat post clamp takes it even further, lowering the clamping point so that more of the post can flex. Put the power down all day long, without the punishment.


Speed Release Thru-Axle

A faster kind of thru-axle. Slotted dropout design lets the axle stay in the hub for quicker, easier wheel changes. Compatible with standard 148x12 hubs. It’s a better way thru.


Build Kit Highlights

  • ALL-NEW F-Si, BallisTec Carbon frame with SAVE technology
  • ALL-NEW Lefty Ocho fork
  • SRAM NX Eagle 1x12 drivetrain components
  • Shimano MT500 hydraulic disc brakes
Full specification can be found in the details tab. 


Additional Information

Model Number C25409M60
Brands Cannondale
Gender Mens
Age Adult
Model Year 2019
Colour Black
Frame ALL-NEW F-Si, BallisTec Carbon, SAVE, PF30A, tapered head tube, Speed Release 12mm thru axle, Ai Offset
Fork ALL-NEW Lefty Ocho, 29", 100mm, Chamber Damper with cable lockout, OppO Spring System, tapered steerer, 55mm offset
Shifters SRAM NX Eagle, 12-speed
Derailleur (Rear) SRAM NX Eagle
Brakes Shimano MT500 hydro disc
Crankset Truvativ Stylo 6K, 34T, Ai Custom
Cassette SRAM PG-1230, NX Eagle, 10-50, 12-speed
Chain SRAM NX Eagle, 12-speed
Hub Front Lefty 60 front
Hub Rear Formula 12x148 rear w/ HG driver
Rims WTB STX i23 TCS, 28h, tubeless ready
Tyres Schwalbe Racing Ray Performance 29 x 2.25" front, Racing Ralph Performance 2.25" rear, Addix Compound, tubeless ready
Handlebar Cannondale C3 Flat, 6061 double-butted Alloy, 8-degree sweep, 760mm
Stem Cannondale C3, 3D Forged 6061 Alloy, 1-1/8", 31.8, 7-degree
Headset Integrated, 1-1/8 to 1.5", sealed angular contact bearings (Integrated steer stop size small only)
Saddle Fabric Scoop Flat Elite, cro-mo rails
Seatpost Cannondale C3, 7075 Alloy, 27.2 x 400mm
Pedal None incl.
Wheel Size 29inch
Number of Gears 12
Ready to ride
Every bike from Start Fitness is fully checked & assembled before despatch and will arrive, almost, ready to ride. Each bike is assembled by one of our CyTech accredited mechanics and then packed into one of our custom boxes. Minimal assembly, with basic tools, is required before you can ride. Assembly tools are not usually included. More details can be found here.
Please note: Some bikes are not supplied with pedals. Manufacturers don’t know if you want flat or clipless pedals, rather than send the bike with the wrong type, they leave the choice for you to make.
This process has a lead time of around 2-3 working days
Unfortunately during peak times this may be slightly delayed. We will however, aim to despatch your bike as quickly as possible.
Making sure you are home
Once fully checked and boxed, we will contact you to book a delivery date. Our bikes are despatched on a next working day service (excludes weekends & bank holidays) for UK mainland orders, or a two day service to Northern Ireland and outlying Scottish areas. European bike deliveries usually take approximately one week.
Taking Delivery
Any mechanical or cosmetic issues need to be reported to us within one week of the delivery date. If you do not plan on using the bike straight away, we advise that you remove it from the box and check it over ASAP as we cannot be responsible for any reported issues (other than standard warranty issues) later than one week from the date that the bicycle was delivered.
First Check-Over
After a few weeks of riding (depending on riding style and conditions), a new bike will need a check-over to make final adjustments and to re-check all nuts and bolts. This is necessary as the bike goes through a ‘bedding in’ phase after which, final adjustment may be necessary. We recommend that this is carried out by a CyTech qualified mechanic. It is important to have these checks carried out to prevent any avoidable problems which may not be covered by warranty and to ensure the smooth running of the bicycle.
We can carry out the first check-over free of charge, at our Newcastle store (NE16JE). If you’ve had the bike delivered, it will be your responsibility to get the bicycle to and from our store for this work to be carried out. This complimentary check-over does not include any labour to replace worn parts or to fit new accessories.
All bikes must be booked in for the first service & must be clean or a £15 cleaning charge will be payable. You can book this by calling 0191 261 4191. Proof of purchase will need to be presented when the bicycle is dropped off for the first check-over.
Bike Servicing
Bicycles need to be serviced regularly, as a guideline we would advise on at least one full service per year and/or a standard service twice a year. If the bike is used regularly in adverse conditions, more regular servicing may be required.

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