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.
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 Topstone Carbon 4 Womens Gravel Bike 2021
The Cannondale Topstone Carbon 4 Women's Gravel Bike is a superb option for anyone looking for adventure. The BallisTec carbon fibre frameset keeps it lightweight while providing all the stiffness you need to power up hills. Already a naturally compliant and comfortable frameset, Cannondale added their Kingpin rear suspension system to really boost the overall comfort levels.
The Shimano GRX 800 groupset is a premium grade, gravel-specific set of components, designed to make riding on unsteady ground efficient and enjoyable. The rear derailleur features a clever clutch mechanism, reducing unwanted chain slap, while the powerful hydraulic disc brakes deliver all the stopping power you need in any conditions.
The 2 x 11-speed drivetrain includes Cannondale's own OPI SpideRing crankset with sub-compact chainrings, paired with an 11-34t cassette. This combination of gearing is excellent for steep gradients over loose ground, with enough speed at the top end for powering along the tarmac home.
- Lightweight and strong BallisTec carbon fibre frame
- Kingpin rear suspension system
- BallisTec Carbon fork provides vibration-reducing lightweight steering
- Gravel specific Shimano GRX groupset
- Powerful Shimano hydraulic disc brakes
- Removeable mudguard bridge
- Large volume 37c clincher tyres from WTB offer offroad stability
- Wide-ranging gear ratio is perfect for any terrain
|Frame||Cannondale BallisTec Carbon Frame, Kingpin suspension system, 12x142 Speed Release Thru-axle, dropper post compatible, direct line cable routing|
|Fork||Cannondale BallisTec Full Carbon, 1-1/8" to 1.5" steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 Speed Release thru-axle|
|Headset||Integrated, 1-1/8" - 1.5"|
|Bottom Bracket||Cannondale BB30|
|Stem||Cannondale 2, 6061 Alloy, 31.8, 7°|
|Handlebar||Cannondale 3, butted 6061 alloy, 16-degree flare drop|
|Bar Tape||Cannondale Bar Tape, 3.5mm|
|Front Brake||Shimano GRX 800 hydraulic disc, 160mm RT70 rotor|
|Rear Brake||Shimano GRX 800 hydraulic disc, 160mm RT70 rotor|
|Brake Levers||Shimano GRX 800 hydraulic disc|
|Front Derailleur||Shimano GRX 800, braze-on|
|Rear Derailleur||Shimano GRX 810, Shadow RD+|
|Shift Levers||Shimano GRX 800, 11-speed|
|Chain||Shimano HG601, 11-speed|
|Cassette||Shimano 105, 11-34, 11-speed|
|Crankset||Cannondale, BB30a, OPI SpideRing, 46/30t|
|Front Wheel||WTB KOM Light i23 TCS, 28-hole, tubeless-ready rim | Formula cartridge bearing, Center Lock, 12x100mm hub | stainless steel, 14-gram spokes|
|Rear Wheel||WTB KOM Light i23 TCS, 28-hole, 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 Flat Elite, cro-mo rails|
|Seatpost||Cannondale 2, UD Carbon, 27.2 x 350mm|
|Pedals||Available to be purchased separately|
|Accessories||Cannondale Wheel Sensor, Removable 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.