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 5 Mountain Bike 2021
With a carbon frame that weighs in at just 900 grams, the Cannondale F-Si Carbon 5 Mountain Bike is super light and built for XC thanks to serious compliance, rugged durability and race-ready responsive handling that's aided by the Ai Offset drivetrain and OutFront steering geometry. The FOX Float Factory 32 SC fork lends 100mm of travel to smooth out rough terrain whilst maintaining precise steering and keeping weight low.
1x12-speed SRAM NX Eagle components keep shifting crisp, with the single front chainring simplifying maintenance and minimising any mid-ride complications. Let the burly 29" wheels carry rolling momentum over obstacles with ease and take speed off in an instant with the sure stopping power of Shimano MT500 hydraulic disc brakes, should a corner or descent have been taken a touch too enthusiastically.
Highlights
- Asymmetric Integration drivetrain for podium-level traction and clearance
- Proprietary BallisTec carbon is custom-tuned for rigidity, compliance and weight-saving
- Shimano MT500 hydraulic disc brakes
- FOX Float 32 SC fork
- Clean, configurable internal cable routing
- SRAM NX Eagle 1x12-speed components
Technical Specification
| Frame | Cannondale BallisTec Carbon, SAVE, PF30-83, tapered head tube, Speed Release 12mm thru-axle, Ai Offset |
| Fork | Fox Float 32 SC, 100mm , 15x100mm thru-axle , remote lockout , tapered steerer , 51mm offset |
| Headset | Cannondale Integrated, 1-1/8 to 1.5”, sealed angular contact bearings (Integrated steer stop size small and extra small only) |
| Bottom Bracket | SRAM DUB PF30 MTB83 |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7° |
| Handlebar | Cannondale 3 Flat, 6061 double-butted Alloy, 31.8mm, 3° rise, 8° sweep, 760mm |
| Grips | Fabric FunGuy |
| Front Brake | Shimano MT500 hydraulic disc, 160mm RT54 rotors |
| Rear Brake | Shimano MT500 hydraulic disc, 160mm RT54 rotors |
| Brake Levers | Shimano MT500 hydraulic disc |
| Rear Derailleur | SRAM NX Eagle |
| Shift Levers | SRAM NX Eagle, 12-speed |
| Chain | SRAM SX Eagle, 12-speed |
| Cassette | SRAM SX Eagle, 11-50, 12-speed |
| Crankset | SRAM Truvativ Stylo 6K DUB, 34T, Ai offset |
| Front Wheel | Shimano MT400, 15x110mm thru-axle hub, WTB STX i23 TCS, 32h, tubeless-ready rim, DT Swiss Champion spokes |
| Rear Wheel | Shimano MT400 12x148mm thru-axle hub, WTB STX i23 TCS, 32h, tubeless-ready rim, DT Swiss Champion spokes |
| Front Tyre | Schwalbe Racing Ray Performance, 29 x 2.25”, Addix Compound, tubeless-ready clincher |
| Rear Tyre | Schwalbe Racing Ralph Performance, 29 x 2.25”, Addix Compound, tubeless-ready clincher |
| Saddle | Fabric Scoop Shallow Sport, steel rails |
| Seatpost | Cannondale 3, 6061 Alloy, 27.2 x 400mm |
| Pedals | Available to be purchased separately |
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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