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.
A precise, gravel specific 11-speed gear setup with a wide range of ratios is ideal for any terrain.
Clearance for big volume tyres grants increased traction and comfort over rough terrain.
Cannondale's extensive aluminium expertise makes the frame light, responsive and durable.
The carbon construction dampens impacts and provides instant steering response.
Cannondale Topstone 1 Gravel Bike 2021
The Cannondale Topstone 1 Gravel Bike is built for long days of exploring over road and trail alike. The SmartForm C2 Alloy frame benefits from decades of Cannondale research into aluminium, delivering a lightweight and durable ride while the BallisTec carbon fibre fork keeps the steering lightweight and responsive.
With a Shimano GRX groupset, this bike is honed for gravel riding, as the hydraulic disc brakes deliver superb stopping power and the rear derailleur's clutch mechanism prevents chain slap as you power over rough ground. The 11-speed cassette has a wide range, making steep hills even more accessible with the sub-compact FSA Omega crankset.
The removable mudguard bridge keeps the bike looking neat without mudguards and provides the versatility to turn it into a super-commuter if you wish. There are also mounts for additional bottle cages, bento boxes and pannier racks, making it a serious bike packing option too. Rolling on a set of WTB 37mm tyres, you're getting great traction off-road and fairly smooth rolling on tarmac. Since the rims and tyres are tubeless-ready compatible, you have the option to convert to a tubeless setup and enjoy even lower tyre pressure for maximum comfort.
- Strong and reliable Cannondale C2 Alloy frame
- BallisTec Carbon fork provides vibration-reducing lightweight steering
- Gravel specific Shimano GRX groupset
- Powerful Shimano hydraulic disc brakes
- Plenty of mounting points for bottles and luggage racks
- Removeable mudguard bridge
- Large volume 37c clincher tyres from WTB offer offroad stability
- Wide-ranging gear ratio is perfect for any terrain
|Frame||Cannondale SmartForm C2 Alloy, 12x142 thru-axle, tapered headtube, flat mount disc, StraightShot internal cable routing, multiple gear/bottle mounts|
|Fork||Cannondale BallisTec Full Carbon, 1-1/8" to 1-1/4" steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru-axle|
|Headset||Integrated, 1-1/8" - 1-1/4"|
|Bottom Bracket||FSA Cartridge|
|Stem||Cannondale 3, 6061 Alloy, 31.8, 7°|
|Handlebar||Cannondale 3, butted 6061 alloy, 16-degree flare drop|
|Front Brake||Shimano GRX 400, hydraulic disc, 160mm RT54 rotor|
|Rear Brake||Shimano GRX 400, hydraulic disc, 160mm RT54 rotor|
|Brake Levers||Shimano GRX 600 hydraulic disc|
|Front Derailleur||Shimano GRX 800, braze-on|
|Rear Derailleur||Shimano GRX 800, Shadow RD+|
|Shift Levers||Shimano GRX 600, 11-speed|
|Chain||KMC X11, 11-speed|
|Cassette||Shimano 105, 11-34t, 11-speed|
|Crankset||FSA Omega AGX+ Alloy, 46/30t|
|Front Wheel||WTB ST i23 TCS, 28h, tubeless-ready rim | Formula cartridge bearing, Center Lock, 12x100mm hub | stainless steel, 14-gram spokes|
|Rear Wheel||WTB ST i23 TCS, 28h, tubeless-ready rim | Formula cartridge bearing, Center Lock, 12x142mm hub | stainless steel, 14-gram spokes|
|Front Tyre||WTB Riddler TCS Light, 700 x 37c, tubeless-ready clincher|
|Rear Tyre||WTB Riddler TCS Light, 700 x 37c, tubeless-ready clincher|
|Saddle||Fabric Scoop Radius Sport, steel rails|
|Seatpost||Cannondale 3, 6061 Alloy, 27.2 x 350mm|
|Pedals||Available to be purchased separately|
|Accessories||Removeable rear mudguard bridge|
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.