Cannondale Topstone Neo SL 2 Electric Bike

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A lightweight, capable and versatile e-bike that thrives on gravel and mixed-terrain riding, the Cannondale Topstone Neo SL 2 was built to chase horizons, explore and accelerate your daily routine.

  • Features

    • SmartForm C2 Alloy frame and a full carbon fork are a lightweight yet durable combo
    • Shimano GRX 400/600 drivetrain and hydraulic disc brakes offer excellent on- and off-road performance
    • Light and powerful Mahle ebikemotion X35 250W rear-hub drive system offers 3 levels of support for pedal assist up to 20 mph and a range of up to 47 mi. (75 km)
    • Multiple gear and bottle mounts let you customize your carry
    • Integrated top tube controller lets you turn the system on, select your assist level and see your battery charge at the touch of a button, keeping your handlebars uncluttered
    • Dialed endurance fit is upright enough for comfort over the long haul and control when tackling off-road terrain, yet low and forward enough for speedy efficiency
    • Roomy frame and fork offer plenty of clearance for the included 700c x 42 mm tires
    • A simple to use, easy-access charging port makes topping up the battery a breeze
    • You can also plug in an optional range extender (not included) for a total battery capacity of 450 Wh and take your rides even farther
    • Pedals not included
    • Specs and images are subject to change


    This e-bike comes with Coast to Coast Support, which includes:
    • 1 year of free adjustments (see more below)
    • In-store bike assembly
    • Pickup in store or curbside
    • Bike experts available at 170+ bike shops
    REI Co-op Members get more:
    • An additional year of free adjustments (2 total years; see below)
    • Free flat tire repairs (labor only; parts not included)
    • 20% off shop services
    More about our free adjustments:
    New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.

    View the Cannondale Topstone Product LineView all Cannondale Gravel Bikes
  • Technical Specs

    Best Use

    Road Cycling

    Gravel Cycling

    E-Bike Classification

    Class 1: pedal assist up to 20 mph


    Mahle ebikemotion X35 250W

    Motor Type

    Geared Hub

    Motor Torque (Nm)

    40 Newton meters

    Battery Type

    Lithium Ion

    Battery Capacity (Wh)

    250 watt hours

    Battery Removable


    Charge Time (hrs)

    4 hours

    Pedal Assist Range

    47 miles


    SmartForm C2 Alloy with flat-mount disc

    Bike Suspension

    No Suspension


    Carbon with 1-1/8 to 1-1/4 in. steerer, 55 mm OutFront offset, flat-mount disc, internal routing, 12 x 100 mm thru axle

    Fork Travel

    Not Applicable


    Shimano GRX 600, 46/30T

    Bottom Bracket

    Shimano BSA Sealed


    Shimano GRX 400, 2 x 10-speed

    Rear Derailleur

    Shimano GRX 400, Shadow RD+

    Rear Cogs

    Shimano HG500, 11-34T, 10-speed

    Number of Gears

    20 gear(s)

    Brake Type

    Hydraulic Disc Brake


    Shimano GRX hydraulic disc, 160 mm RT56 rotors

    Brake Levers

    Shimano GRX hydraulic disc


    Cannondale Disc, double wall, tubeless-ready 32h in rear and 28h in front

    Front Hub

    Formula CL-712, 12 x 100 mm thru axle, disc

    Rear Hub

    Mahle ebikemotion X35; 135 mm bolt-on

    Wheel Size



    WTB Resolute Comp, 700c x 42 mm, tubeless-ready

    Tire Width

    42 millimeters

    Handlebar Shape

    Drop Bar


    Cannondale 3, butted 6061 alloy, 16 degree flare drop


    Cannondale 3, 6061 alloy, 31.8 mm, 7 degree

    Seat Post

    Promax SP-2032, alloy, 27.2 mm


    Fabric Scoop Shallow Sport, steel rails


    Not included


    Integrated; 1-1/2 to 1-1/8 in. (lower to upper) tapered with reducer; 25 mm alloy top cap




    32 lbs. 6.4 oz.

    Bike Weight

    Bike weight is based on median size, as sold, or the average of two median sizes.



  • Size Chart

    Reach37.7 38.7 39.440.2
    Effective Top Tube53.4 55.356.958.6
    Seat Tube Center-Top44.549.053.558.0
    Standover Height75.1 79.0 83.086.9
    Head Tube Length12.615.719.1 22.2
    Head Tube Angle (degrees)70.5°71.0°71.0°71.0°
    Seat Tube Angle (degrees)74.0°74.0°74.0°74.0°
    Bottom Bracket Height65.465.465.465.4
    Wheelbase103.1 104.7106.5108.3
    Fork Offset5.

    Sizing Notes

    Measurements are stated in centimeters unless otherwise indicated.

    How we measure bikes

    1. Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
    2. Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
    3. Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
    4. Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
    5. Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
    6. Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
    7. Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
    8. Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
    9. Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
    10. Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
    11. Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
    12. Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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