Cannondale Topstone Carbon 1 Lefty AXS SMU – Carbon Gravel Bike with Lefty Oliver and SRAM AXS

The Cannondale Topstone Carbon 1 Lefty AXS SMU is a premium carbon gravel bike designed for riders who want to explore gravel roads, rough tracks and technical trails without compromising on speed, comfort or handling precision.

The Topstone Carbon frame with KingPin rear suspension is paired with the distinctive 40mm Lefty Oliver single-sided suspension fork, creating a setup particularly well suited to uneven terrain.

The SRAM Rival AXS and GX Eagle AXS 12-speed wireless electronic drivetrain, Reserve 40|44 GR carbon wheels and multiple accessory mounting points make this gravel bike suitable for both performance-oriented riding and long-distance adventures.

Topstone Carbon Frame with KingPin Suspension

The Cannondale Topstone Carbon 1 Lefty AXS SMU features a carbon fiber frame with the KingPin suspension system, which uses controlled frame flex and a dedicated pivot to provide compliance over rough surfaces.

This system helps absorb terrain vibrations and impacts without requiring a conventional rear shock, improving comfort and traction while pedaling.

The Proportional Response construction optimizes frame design according to size, helping deliver balanced handling characteristics for riders of different heights.

The frame also features internal cable routing, a 12x142mm rear thru-axle, a UDH derailleur hanger, a threaded 68mm BSA bottom bracket shell and multiple mounting points for bottles and accessories.

40mm Lefty Oliver Suspension Fork: Control on Technical Terrain

One of the most distinctive features of the Cannondale Topstone Carbon 1 Lefty AXS SMU is its Lefty Oliver single-sided suspension fork, specifically developed for gravel riding.

The fork provides 40mm of suspension travel and features a Gen 2 Chamber Damper with All-Over tuning, an ISO High-Ride air spring and a lockout system.

This configuration helps absorb vibrations and impacts, improving front-wheel control on uneven surfaces and technical sections.

The 55mm fork offset contributes to a balance of stability and responsive handling on gravel terrain.

SRAM Rival AXS and GX Eagle AXS 12-Speed Electronic Drivetrain

The Topstone Carbon 1 Lefty AXS SMU features a SRAM AXS 12-speed wireless electronic drivetrain, combining SRAM Rival AXS and GX Eagle AXS components.

The SRAM GX Eagle AXS T-Type rear derailleur is paired with SRAM Rival AXS shifters, providing electronic shifting and wireless control.

The SRAM Rival XPLR Wide crankset with a 42T chainring works with the SRAM GX XS-1275 10-52T cassette, delivering a wide gear range for steep climbs and fast gravel sections.

The drivetrain is completed by a SRAM GX Eagle T-Type 12-speed chain and a SRAM DUB BSA Road 68 Wide bottom bracket.

Reserve 40|44 GR Carbon Wheels

The Cannondale Topstone Carbon 1 Lefty AXS SMU is equipped with Reserve 40|44 GR Carbon rims, developed for gravel riding and featuring Turbulent Aero Tech.

The wheels feature differentiated 40mm and 44mm rim profiles and are tubeless ready.

The wheelset includes a Lefty 50 front hub, a DT Swiss 370 rear hub with Ratchet LN and Sapim CX-Delta spokes.

This configuration combines aerodynamic design, durability and precise handling for varied gravel terrain.

WTB Vulpine TCS Light 700x45c Tires

The bike comes equipped with WTB Vulpine TCS Light 700x45c tires, ready for a tubeless setup.

The 45mm tire width provides a balance of rolling efficiency, comfort and off-road capability, making the Topstone suitable for mixed terrain and long-distance riding.

With a single-chainring drivetrain, the frame accommodates tires up to 52mm, while the Lefty Oliver fork has a stated maximum tire width of 47mm. Actual clearance depends on the measured tire dimensions.

SRAM Rival Hydraulic Disc Brakes

Braking performance is provided by SRAM Rival hydraulic disc brakes, designed to offer control and modulation on both paved roads and gravel tracks.

The setup includes 160mm SRAM CenterLine X rotors at the front and rear, with a 6-bolt front rotor mount and Center Lock rear mount.

The integrated SRAM Rival AXS controls allow riders to operate both the brakes and electronic shifting directly from the handlebar.

StashPort: Integrated Frame Storage

The Cannondale Topstone Carbon 1 Lefty AXS SMU features the StashPort storage system, a practical compartment integrated into the frame's downtube.

Accessible beneath the bottle cage, it allows riders to carry small accessories and essential items during their rides.

The bike includes a large StashBag, designed to organize items inside the frame.

Multiple mounting points for bottles and accessories make this bike suitable for bikepacking and multi-day cycling adventures.

Easton EA70 AX Handlebar and Cannondale SAVE Carbon Seatpost

The cockpit features an Easton EA70 AX aluminum handlebar with 16° flare and 120mm drop, designed to provide control and multiple hand positions during gravel riding.

The Cannondale C1 Conceal stem contributes to an integrated cockpit design and tidy cable routing.

The 27.2mm Cannondale SAVE Carbon seatpost is designed to improve comfort over rough surfaces and is paired with a 140mm Fizik Terra Argo X5 saddle.

The frame is also compatible with internally routed 27.2mm dropper seatposts for riders who want to further customize their bike for technical terrain.

Who Is the Cannondale Topstone Carbon 1 Lefty AXS SMU For?

The Cannondale Topstone Carbon 1 Lefty AXS SMU is designed for cyclists looking for a carbon gravel bike with a suspension fork, KingPin suspension and SRAM AXS electronic shifting.

It is particularly suitable for:

• Performance gravel riding: Training and fast rides on gravel roads and unpaved tracks.
• Gravel racing: Competitive riding on challenging mixed-terrain courses.
• Trails and singletrack: Technical routes where control and suspension compliance make a difference.
• Bikepacking: Multi-day trips with bags and accessories.
• Long-distance riding: Routes where comfort and versatility are essential.

Cannondale Topstone Carbon 1 Lefty AXS SMU Technical Specifications

• Brand: Cannondale
• Model: Topstone Carbon 1 Lefty AXS SMU
• Model code: C1519GU SMU
• Category: Carbon gravel bike
• Frame: Topstone Carbon, KingPin suspension, Proportional Response construction
• Frame storage: Integrated StashPort downtube compartment
• Cable routing: Internal
• Rear thru-axle: 12x142mm
• Derailleur hanger: UDH
• Bottom bracket: SRAM DUB BSA Road 68 Wide, threaded
• Frame brake mount: Flat Mount
• Dropper post compatibility: 27.2mm, internal routing
• Accessory mounts: Multiple bottle and gear mounts
• Fender bridge: Removable
• Fork: Lefty Oliver, single-sided, 40mm travel
• Fork damper: Gen 2 Chamber Damper, All-Over tuning
• Fork spring: ISO High-Ride air spring
• Fork lockout: Included
• Fork offset: 55mm
• Headset: Acros IS52/40 ICR
• Rear derailleur: SRAM GX Eagle AXS T-Type, wireless electronic, 12-speed
• Shifters: SRAM Rival AXS, 12/13-speed compatible
• Crankset: SRAM Rival XPLR Wide, 42T single chainring
• Crank arm lengths: 165mm (47), 170mm (51), 172.5mm (54-56), 175mm (58-61)
• Cassette: SRAM GX XS-1275, 10-52T, T-Type, 12-speed
• Chain: SRAM GX Eagle T-Type, 12-speed
• Brakes: SRAM Rival hydraulic disc
• Brake levers: SRAM Rival AXS
• Rotors: SRAM CenterLine X, 160/160mm
• Rotor mounting: 6-bolt front, Center Lock rear
• Rims: Reserve 40|44 GR Carbon, Turbulent Aero Tech, 24-hole, tubeless ready
• Wheel size: 700c
• Front hub: Lefty 50, 6-bolt
• Rear hub: DT Swiss 370 LN Ratchet System, 12x142mm, Center Lock
• Spokes: Sapim CX-Delta
• Tires: WTB Vulpine TCS Light, 700x45c, tubeless ready
• Handlebar: Easton EA70 AX, aluminum, 16° flare, 120mm drop
• Handlebar widths: 400mm (47), 420mm (51-54), 440mm (56-61)
• Stem: Cannondale C1 Conceal, aluminum, 31.8mm clamp, -6° angle
• Stem lengths: 70mm (47-51), 80mm (54), 90mm (56-58), 100mm (61)
• Handlebar tape: Cannondale KnurlCork, 2.7mm
• Saddle: Fizik Terra Argo X5, 140mm, S-Alloy rails
• Seatpost: Cannondale SAVE Carbon, 27.2mm diameter
• Seatpost lengths: 350mm (47-58), 400mm (61)
• Included accessories: Large StashBag, Reserve Fillmore tubeless valves, SRAM AXS charger, Cannondale Conceal Garmin/Wahoo-compatible computer/accessory mount
• Recommended use: Gravel riding, gravel racing, bikepacking, unpaved roads and singletrack

Technical specifications may be changed by the manufacturer without prior notice. Certain component dimensions vary according to frame size.