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 Topstone 1 GRX Gravel Bike
Discover the Topstone Alloy, a gravel bike that combines simplicity, reliability, and a whole lot of fun, catering to those with a taste for adventure without compromising on value. Whether you prefer a light and carefree ride or loading up for an extended journey, the Topstone's comfortable ride, confident handling, and versatile capabilities make it the ideal companion on any road, anywhere.
Experience the sensation of lightness with Topstone's SmartForm C2 Alloy construction, a testament to Cannondale's decades of expertise in aluminum craftsmanship. The full carbon fork, featuring a tapered steerer and 12mm thru-axle, ensures a light, comfortable, and precise-steering front end, embodying the bike's smooth yet snappy character. With innovative features like an all-new carbon fork designed for maximum cargo capacity and easy fender mounting points, the Topstone Alloy embraces versatility for any adventure. Its out-front steering geometry, combining confident stability with nimble agility, ensures a light and lively steering feel, providing unmatched confidence at speed and in challenging terrains. Plus, the Topstone is dropper-ready, ready to accommodate an internally-routed 27.2 dropper seatpost, showcasing its off-road capability and adaptability to diverse riding preferences.
Technical Specification
| Frame | Lightweight SmartForm C2 Alloy, 12x142 thru-axle, tapered headtube, BSA threaded BBm flat mount disc, StraightShot internal cable routing, multiple gear/bottle mounts |
| Fork | Topstone Carbon, 1-1/8" to 1.5" steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru-axle, fender/gear mounts |
| Rims | WTB ST i23 TCS, 28h, tubeless ready |
| Hubs | (F) Formula cartridge bearing, 12x100mm centerlock / (R) Formula cartridge bearing, 12x142mm centerlock |
| Spokes | Stainless Steel, 14g |
| Tires | WTB Riddler TCS Light, 700 x 37c, tubeless ready |
| Pedals | Not included (sold separately) |
| Crank | Shimano GRX 600, 46/30 |
| Bottom Bracket | Shimano BSA 68 |
| Chain | Shimano HG M7100, 12-speed |
| Rear Cogs | Shimano HG R7100, 11-34, 12-speed |
| Front Derailleur | Shimano GRX 820, braze-on |
| Rear Derailleur | Shimano GRX 820, Shadow RD+ |
| Shifters | Shimano GRX 600, 12-speed |
| Handlebar | Cannondale 3, butted 6061 Alloy, 16 deg flare drop |
| Grips | Cannondale Bar Tape, 3.5mm |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7° |
| Headset | ntegrated, 1-1/8" - 1.5" |
| Brakes | Shimano GRX 600 hydraulic disc, 160/160mm RT64 rotors |
| Saddle | Fizik Aliante Delta, S-alloy rails |
| Seatpost | Cannondale 3, 6061 Alloy, 27.2 x 350mm |
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.
Cannondale Topstone 1 GRX Gravel Bike Sizing
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