Cannondale Synapse Alloy Disc Bike - 2017

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Delivering equal measures of comfort and performance, the Cannondale Synapse Alloy Disc bike is the ideal ride for someone looking for a roadworthy drop-bar bike at an affordable price.

  • Features

    • Cannondale SmartForm alloy aluminum construction is focused on delivering the strongest, lightest, best handling frame possible
    • Premium 6069 and 6061 alloy tube sets are highly manipulated to extract every ounce of performance
    • Double-pass welds provide strong, smooth joints and eliminate the need for internal reinforcements or external welded-on gussets
    • Each frame is heat treated after welding to maximize the strength and hardness of the aluminum, increasing durability
    • S.A.V.E. Plus micro-suspension flexes to absorb shock and keep the wheel tracking smoothly over bumps; 25.4mm seatpost and seat tube deflect together for comfort in the saddle
    • Shimano Tiagra levers and derailleurs supply dependable shifting through the 20 gears
    • RD 3.0 disc rims are suited up with Schwalbe Lugano tires for low rolling resistance and grippy handling
    • Specs are subject to change


    Free Adjustment Period:
    New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. 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 all Cannondale Endurance Bikes
  • Technical Specs

    Best Use

    Road Cycling

    Bike Frame Material



    SmartForm C2 alloy


    Synapse carbon

    Bike Suspension

    No Suspension


    FSA Omega, BB30, 50/34

    Bottom Bracket

    FSA BB30


    Shimano Tiagra

    Front Derailleur

    Shimano Tiagra, 31.8 clamp

    Rear Derailleur

    Shimano Tiagra GS

    Rear Cogs

    Shimano HG500, 12-30, 10-speed

    Number of Gears


    Brake Type

    Mechanical Disc Brake


    Promax Render R, 160mm front, 140mm rear

    Brake Levers

    Shimano Tiagra


    RD 3.0 Disc, 28-hole

    Front Hub

    Formula DC1420

    Rear Hub


    Wheel Size



    Schwalbe Lugano, 700x25c

    Tire Width

    25 millimeters

    Handlebar Shape

    Drop Bar


    Cannondale C4 Compact, 6061 alloy


    Cannondale C4 Compact, 6061 alloy

    Seat Post

    Cannondale C4, Alloy, 25.4x300mm (48-51) 350mm (54-61)


    Cannondale Stage Ergo


    Wellgo with clip and strap


    Synapse Si, 25mm top cap


    FSA CN-910, 10-speed


    22 pounds

    Bike Weight

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



  • Size Chart

    51 cm 54 cm 56 cm 58 cm 61 cm
    Height Range 5’3”- 5’6” 5’6” - 5’9” 5’9” - 6’0” 6'0" - 6'3" 6'3" - 6'6"
    Reach 36.8 37.6 38.4 39.2 40
    Stack 55.7 57.6 59.7 61.8 63.9
    Effective Top Tube 52.4 54.2 56.1 58.1 60.1
    Seat Tube Center-Top 46 49 52 54.5 57.5
    Standover Height 74.5 77.4 80.5 82.7 85.7
    Head Tube Length 14.6 16.6 18.6 20.8 23
    Head Tube Angle (degrees) 71.3 72 72.5 73 73
    Seat Tube Angle (degrees) 74.3 73.9 73.5 73 72.5
    Bottom Bracket Height 26.5 26.8 26.8 27 27
    Wheelbase 98.7 99.6 100.5 101.5 103
    Chainstay 41 41 41 41 41
    Fork Offset 5 5 5 5 5

    Sizing Notes

    Measurements are stated in centimeters.

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