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.
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.
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.
This wireless, electronic gear setup shifts impeccably amongst its 12-speed cassette.
A gravel-specific suspension fork, the Lefty Oliver grants 30mm of bump taming travel.
Cannondale Topstone Carbon Lefty 1 Disc Gravel Road Bike 2021
The Cannondale Topstone Carbon Lefty 1 Disc Gravel Road Bike has been conceived via a brand new project with the aim of creating the ultimate gravel adventure bike. Blending a comprehensive gamut of advanced materials and technologies the Topstone Lefty furthers exploration into the previously unknown.
The frame is constructed from BallisTec Carbon to naturally afford a snappy and responsive ride. This material is laid within a specific pattern across each tube section to custom-tune the ride sensation by size before an innovative Kingpin suspension design is seamlessly integrated into the rear triangle configuration. This dampening arrangement offers up to 30mm of travel but, thanks to its LockR Pivot system, guarantees reactive forward drive with every pedal stroke. The Lefty fork then compliments by offering bump-taming compliance within a stiff and lightweight structure for optimally precise handling, even across the most technical of surfaces.
The wheelset is born from Cannondale's own composite knowledge and features a carbon rim layup that grants strength, low weight and rough surface compliance. A 23mm internal width ensures that big volume tyres can be seated with increased sidewall support before DT Swiss hub internals provide smooth spinning and robust bearings. 650b x 47mm WTB tyres then offer maximum traction, cornering grip and plush levels of comfort via their capacious air volume.
Any topography can be conquered thanks to the vast range of gears provided by the 12-speed cassette and these are actuated with preciseness by the SRAM AXS wireless, electronic groupset. A fully hydraulic brake system provides modulated and powerful stopping within any conditions before a carbon Hollowgram finishing kit and mudguard compatibility complete a thoroughly comprehensive gravel package.
- 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 peddling response
- Proportional Response Construction: Suspension and overall frame ride-feel is custom tuned by size, using different carbon layup and different tube dimensions
- Lefty Oliver Carbon fork with 30mm of travel
- Dialed Endurance Fit: Offers a perfectly balanced riding position
- 650b, HollowGram 23, Superlight Hi-Impact Carbon wheelset with high volume 47mm wide tyres
- Combined SRAM Force eTap AXS and SRAM X01 Eagle eTap AXS, Wireless, Electronic, 12-speed groupset
- SRAM Centerline hydraulic brake configuration
- Hollowgram SAVE 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
|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 w/ All-Over tune | ISO High-Ride air spring | tapered steerer | 650b | 55mm offset|
|Headset||Integrated, 1-1/8" - 1-1/2"|
|Stem||HollowGram SAVE, Alloy, -6-degree|
|Handlebar||HollowGram SAVE SystemBar, Carbon, 8 deg. pitch adjust|
|Front Brake||Hydraulic SRAM Centerline, 160mm rotor|
|Rear Brake||Hydraulic SRAM Centerline, 160mm rotor|
|Brake Levers||SRAM Force AXS|
|Rear Derailleur||SRAM X01 Eagle eTap AXS, Wireless, Electronic, 12-speed|
|Shift Levers||SRAM Force eTap AXS HRD, Wireless, Electronic,12-speed|
|Cassette||SRAM PG-1295, X01 Eagle, 10-50, 12-speed|
|Chain||SRAM X01 Eagle, 12 Speed|
|Crankset||SRAM Force AXS 1x Crankset, DUB Spindle, 40 Tooth Chainring|
|Bottom Bracket||SRAM DUB BB30 83-A|
|Front Wheel||HollowGram 23, Superlight Hi-Impact Carbon Rims, 28 hole, 23mm Internal Width, tubeless-ready | Lefty 50 6-bolt hub with DT Swiss 370 Internals | 28 x HollowGram 2.0/1.8/2.0 Spokes|
|Rear Wheel||HollowGram 23, Superlight Hi-Impact Carbon Rims, 28 hole, 23mm Internal Width, tubeless-ready | HollowGram 12x142mm centerlock hub with DT Swiss 370 Internals | 28 x HollowGram 2.0/1.8/2.0 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 Race, ti rails|
|Seatpost||HollowGram SAVE Carbon, 27.2 x 350mm|
|Pedals||Available to be purchased separately|
|Manufacturer Claimed Weight||9.0kg / 19.84lbs, 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 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.
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 or contact Customer Care. We do not install accessories to bikes, including mudguards.