Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
Cannondale F-Si Carbon 4 29" Mountain Bike 2019
Whether it's for cross country racing or just enjoying travelling quickly through the countryside, the Cannondale F-Si Carbon 4 29" Mountain Bike is a great option. Up front, the Lefty Ocho fork provides 100mm of travel, with the option to lock it out remotely for greater efficiency on smoother sections, whilst the BallisTec carbon frame features Cannondale’s AI (Asymmetric Integration) system. This allows for shorter seatstays by moving the drivetrain components outwards a little but still leaves room for larger tyres.
SRAM’s 12-speed NX Eagle groupset and Truvativ Stylo 6K crankset offer a wide range of gears courtesy of the massive 11-50 tooth cassette and 34 tooth chainring in a simple 1x arrangement. The MT500 hydraulic disc brakes from Shimano work whatever the weather, increasing confidence for cornering and downhills. Riding tubeless allows lower pressures to be used without the risk of pinch punctures and increases both comfort and grip; the WTB STX i23 TCS rims used on the F-Si Carbon 4 are fully compatible with a tubeless set up if so desired.
Features
- Cannondale BallisTec carbon frame
- Cannondale Lefty Ocho fork with 100mm travel and cable lockout
- SRAM NX Eagle 12-speed drivetrain
- Shimano MT500 hydraulic disc brakes
- WTB STX i23 TCS tubeless ready rims
Technical Specification
| FRAME | Cannondale F-Si, BallisTec carbon, SAVE, PF30A, tapered head tube, Speed Release 12mm thru axle, Ai Offset |
| FORK | Cannondale Lefty Ocho, 29", 100mm, Chamber Damper with cable lockout, OppO Spring System, tapered steerer, 55mm offset |
| STEM | Cannondale C3, 3D forged 6061 Alloy, 1-1/8", 31.8, 7 degree |
| HANDLEBAR | Cannondale C3 Flat, 6061 double-butted alloy, 8 degree sweep, 760mm |
| FRONT BRAKE | Shimano MT500 hydraulic disc, 160mm RT66 rotors |
| REAR BRAKE | Shimano MT500 hydraulic disc, 160mm RT66 rotors |
| BRAKE LEVERS | Shimano MT500 hydraulic disc |
| FRONT DERAILLEUR | N/A |
| REAR DERAILLEUR | SRAM NX Eagle |
| SHIFT LEVERS | SRAM NX Eagle, 12-speed |
| CASSETTE | SRAM PG-1230, NX Eagle, 11-50t, 12-speed |
| CRANKSET | Truvativ Stylo 6K, 34t, Ai Custom |
| FRONT WHEEL | Cannondale Lefty 60 hub, WTB STX i23 TCS, 28h, tubeless ready |
| REAR WHEEL | Formula 12x148 with HG driver hub, WTB STX i23 TCS, 28h, tubeless ready |
| FRONT TYRE | Schwalbe Racing Ray Performance 2.25" tubeless ready clincher |
| REAR TYRE | Schwalbe Racing Ralph Performance 2.25" tubeless ready clincher |
| SADDLE | Fabric Scoop Flat Elite, cro-mo rails |
| SEATPOST | Cannondale C3 alloy, 27.2mm |
| CLAIMED WEIGHT | 10.8kg size medium |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
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