Why buy your bike from Sigma Sports?
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All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
Cyclescheme can save you up to 39% on a bike and accessories. Visit our Cycle to Work Scheme page to learn more and claim.
Product Highlights
The BallisTec carbon frame is light, stiff and compliant for a lively but composed ride.
The lightweight Kingpin system at the rear of the frame gives up to 30mm of plush suspension.
A precise, gravel specific 11-speed gear setup with a wide range of ratios is ideal for any terrain.
A gravel-specific suspension fork, the Lefty Oliver grants 30mm of bump taming travel.
Cannondale Topstone Carbon Lefty 3 Disc Gravel Road Bike 2021
A company project that researched the specific requirements of gravel riding has conceived the Cannondale Topstone Carbon Lefty 3 Disc Gravel Bike. Designed from the ground up, the Topstone Lefty Carbon delivers the pinnacle of performance to all adventure riders who have an unsatisfied desire to explore further and higher into the previously uncharted.
The frame utilises BallisTec Carbon and this material is configured within a size-specific pattern to grant a reactive and positive ride experience. Integrated into this main chassis is the Kingpin suspension configuration that, thanks to the amalgamated specific tube profiles and LockR Pivot system, provides 30mm of plush travel to absorb impacts and increase rear wheel traction. The Lefty Oliver fork then compliments the chassis with its lightweight and stiff suspension construction increasing ride accuracy and control over even the harshest of roads and paths.
The 650b wheelset features WTB alloy rims that are burly and composed with their circumference permitting the use of the ultra-wide 47mm tyres. This tyre width provides all of the grip and control necessary for the heaviest of gravel roads before a robust hubset ensures of low-maintenance and reliability within the harshest of conditions.
Any landscape, from fast roads to technical off-road climbs, can be conquered thanks to the wide-ranging 11-speed cassette with this being actuated by the reliable and crisp gear changes of the Shimano GRX groupset. The consistent and efficient forward drive is then provided by the revered Cannondale crank arms before the fully hydraulic brake system ensures powerful but controlled stopping through any conditions.
The already comprehensive features list is then crowned with a vibration killing Cannondale carbon seatpost, aesthetically pleasing and maintenance-friendly cable routing and full mudguard compatibility for when wet weather protection is required.
Highlights
- A super-versatile gravel bike with innovative Kingpin rear suspension and Lefty fork suspension provides complete off-road capability and sublime on-road comfort
- Cannondale BallisTec Carbon Frame with Kingpin LockR Pivot rear suspension system that provides up to 30mm of travel and instant pedalling response
- Proportional Response Construction: Suspension and overall frame ride-feel is custom tuned by size, using different carbon layup and different tube dimensions
- All-New Lefty Oliver Carbon fork with 30mm of travel
- Dialed Endurance Fit: Offers a perfectly balanced riding position
- Robust and reliable 650b WTB alloy wheelset with high volume 47mm wide tyres
- Shimano GRX 11-speed gravel-specific groupset
- Shimano GRX hydraulic brake configuration
- Cannondale finishing kit
- DirectLine cable routing provides easy internal cable routing
- Dropper Ready: Built to accept an internally-routed 27.2 dropper seatpost
- Fully mudguard ready. A removable mudguard bridge on the rear stays facilitates easy removal
Technical Specification
| Frame | Cannondale BallisTec Carbon Frame | Kingpin suspension system | 12x142 Speed Release thru-axle | dropper post compatible | direct line cable routing |
| Fork | Cannondale Lefty Oliver Carbon | 30mm travel | Chamber Damper with All-Over tune | ISO High-Ride air spring | tapered steerer | 650b | 55mm offset |
| Headset | Integrated, 1-1/8" - 1-1/2" |
| Stem | Cannondale 2, 6061 Alloy, 31.8, 7° |
| Handlebar | Cannondale 3, butted 6061 alloy, 16-degree flare drop |
| Grips | Cannondale Bar Tape, 3.5mm |
| Front Brake | Shimano GRX 400 hydraulic disc,160mm RT76 rotor |
| Rear Brake | Shimano GRX 400 hydraulic disc, 160mm RT76 rotor |
| Brake Levers | Shimano GRX 600 hydraulic disc |
| Front Derailleur | N/A |
| Rear Derailleur | Shimano GRX 800 Wide, 11-speed |
| Shift Levers | Shimano GRX 600, 11-speed |
| Cassette | Shimano SLX, 11-42, 11-speed |
| Chain | Shimano HG601, 11-speed |
| Crankset | Cannondale 1, BB30a, OPI SpideRing, 40 tooth chainring |
| Bottom Bracket | Cannondale BB30 |
| Front Wheel | WTB ST i23 TCS, 28 hole, tubeless-ready alloy rims, | Lefty 50 6-bolt hub | 28 x stainless steel, 14g spokes |
| Rear Wheel | WTB ST i23 TCS, 28 hole, tubeless-ready alloy rims | Formula DHT142, 12x142mm center lock hub | 28 x stainless steel, 14g spokes |
| Front Tyre | WTB Venture TCS Light, 650 x 47c, tubeless-ready |
| Rear Tyre | WTB Byway TCS Light, 650 x 47c, tubeless-ready |
| Saddle | Fabric Scoop Shallow Elite, cro-mo rails |
| Seatpost | Cannondale 2, UD Carbon, 27.2 x 350mm |
| Pedals | Available to be purchased separately |
| Manufacturer Claimed Weight | 9.5kg / 20.94lbs (size S) |
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 specified), 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.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. We do not install accessories to bikes, including mudguards.