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.
We've partnered with Pedalsure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Cannondale Topstone 1 Gravel Bike 2023
Cannondale's Topstone 1 is built for adventure. This extremely capable gravel bike combines a strong SmartForm C2 alloy frame with a carbon fork and Shimano gravel-specific components to deliver comfort and good traction over all terrains while keeping weight to a minimum. OutFront steering geometry with a longer fork and slacker head angle creates an agile ride feel with plenty of stability.
The frame and fork incorporate plenty of mounts for bottles, mudguards and luggage, and the WTB wheels have been fitted with wide 35mm Vittoria tyres to soak up the bumps. There's room to go even wider - 45mm - if preferred. When tackling steeper, trickier terrain, you may appreciate the ability to swap out the seatpost for a dropper post.
GRX 800 and 600 are Shimano's highest-level groupsets that are aimed specifically toward gravel riding. Shadow technology in the rear mech provides chain stability and the cassette and chainring combination give a wide gear range to help manage both the ups and downs. Hydraulic discs ensure powerful stopping as and when required, in all conditions.
Highlights
- Strong and reliable Cannondale C2 alloy frame and carbon fork
- Shimano GRX 800/600 11-speed groupset
- Powerful Shimano hydraulic disc brakes
- Plenty of mounting points for bottles and luggage racks
- Built to accept an internally routed 27.2mm dropper seatpost
- Removable mudguard bridge
- Large volume 35c clincher tyres from Vittoria offer offroad stability
- Wide-ranging gear ratio is perfect for any terrain
- Clearance for 45mm tyres
- Compatible with the Cannondale Wheel Sensor (purchased separately)
Technical Specification
| Frame | Cannondale SmartForm C2 Alloy, 12x142 thru-axle, tapered headtube, flat mount disc, BSA threaded BB, flat mount disc, StraightShot internal cable routing, multiple gear/bottle mounts |
| Fork | Cannondale Topstone Carbon, 1-1/8" to 1.5" steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru-axle, mudguard/gear mounts |
| Headset | Integrated, 1-1/8" - 1-1/2" |
| Bottom Bracket | Shimano BBRS500 |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7° |
| Handlebar | Cannondale 3, butted 6061 alloy, 16° 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 810, Shadow RD+ |
| Shift Levers | Shimano GRX 600, 11-speed |
| Chain | KMC X11, 11-speed |
| Cassette | MicroSHIFT, 11-34t, 11-speed |
| Crankset | FSA Gossamer Pro, 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 | Vittoria Terreno Dry, 700 x 35c, tubeless-ready clincher |
| Rear Tyre | Vittoria Terreno Dry, 700 x 35c, tubeless-ready clincher |
| Saddle | Fizik Aliante Delta, S-alloy rails |
| Seatpost | Cannondale 3, 6061 Alloy, 27.2 x 350mm |
| Pedals | Available to be purchased separately |
| Accessories | Removable 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. 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.