We use cookies to improve your experience on our website and to show you personalised content.
You can read our Cookie and Privacy policy or manage them individually.
You can read our Cookie and Privacy policy or manage them individually.
Description
Discover the ultimate dual-suspension gravel bike engineered for conquering rugged dirt roads and singletrack trails effortlessly. Equipped with the innovative Kingpin system and Lefty fork, this bike breaks boundaries, making no terrain impassable. Designed to thrive on gravel and dirt roads, rough pavement, and trails, it's built for gravel riding, back road exploration, bike packing, and off-road adventures. Featuring a lightweight Topstone Carbon frame with Kingpin suspension and Lefty Oliver gravel suspension fork offering 30mm travel, this bike ensures a smooth, agile ride. With WTB KOM Light rims, it combines durability with performance. Kingpin Suspension delivers unparalleled comfort, traction, and agility without the added weight and complexity of traditional shocks, making it ideal for demanding gravel riders. Meanwhile, Lefty Oliver provides the smoothest, most precise handling with 30mm of bob-free travel and ample tire room. Loaded with gear and waterbottle mounts on the frame and fork, the Topstone Carbon is ready for extended adventures. Its OutFront steering geometry ensures stability through rough terrain while maintaining lightness and agility elsewhere, allowing you to corner like a boss and emerge with a smile. Don't just ride, conquer every path with confidence and ease.
Frame | Topstone Carbon, Kingpin suspension system, SmartSense compatible, Proportional Response construction, 12x142mm thru-axle, 27.2 dropper post ready, BSA 68mm threaded BB, DirectLine internal cable routing, removable fender bridge, multiple gear/bottle mounts |
Fork | Lefty Oliver, 30mm travel, lockout, Chamber Damper w/ All-Over tune, ISO High-Ride air spring, tapered steerer, 700c, 55mm offset |
Rims | WTB KOM Light i23 TCS, 700c, 28h, tubeless ready |
Hubs | (F) Lefty SL, 6-Bolt / (R) Shimano MT410 Centerlock Disc, 12x142mm |
Spokes | Stainless Steel, 14g |
Tires | WTB Raddler TCS Light, 700x44c, tubeless ready |
Pedals | Not included |
Crank | Shimano GRX 610, 40T |
Bottom Bracket | Shimano BSA 68 |
Chain | Shimano HG M7100, 12-speed |
Rear Cogs | Shimano SLX M7100, 10-45, 12-speed |
Rear Derailleur | Shimano GRX 822, Shadow RD+ |
Shifters | Shimano GRX 820, 12-speed, w/ dropper actuator |
Handlebar | Cannondale 2 ShortDrop, 7050 alloy, 12 deg flare drop |
Grips | Fizik Solocush Soft, 3mm |
Stem | Cannondale 2, 6061 Alloy, 31.8, 7° |
Headset | Integrated, Carbon, 1-1/8" - 1-1/2" |
Brakes | Shimano GRX 800 hydraulic disc, 160/160mm MT800/RT86 rotors |
Saddle | Fizik Terra Argo X5, S-alloy rails |
Seatpost | Cannondale DownLow Dropper Post, 27.2, 60/80/100mm travel, shifter-integrated lever |
Extras | StrapRack Tool Carrier |
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.
Size Guide
Delivery & Returns
Reviews
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Q&A
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Oh, dear. You tried too many passwords and now your account has been locked for the next 30 minutes.
Not sure of your password? Reset using the link below.
We've sent you an email to reset your password.
To create your new password, click the link in the email and enter a new one. Didn't receive the email? Check your junk email.
Please enter your registered email address below and we'll send you an email explaining the next step.
Select a store
Select the store you visit most frequently below and their stock information will show on product pages.
Important Update for Our Canadian Customers
We regret to inform you that shopping on Sigma Sports is temporarily unavailable for customers based in Canada.
We understand how disappointing this may be and sincerely apologize for any inconvenience caused. Please rest assured that we are actively exploring solutions to resume service and find the best way to support our Canadian community.
We appreciate your patience and understanding during this time, and we look forward to welcoming you back as soon as possible.
If you require any further assistance, please reach out to the customer services team
— The Sigma Sports Team