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  • Synapse aluminum frame is built to give riders great handling, stability and steering precision in a more comfortable, upright position than race-oriented road frames
  • Rear part of the frame and the carbon-bladed fork feature the Cannondale Synapse Active Vibration Elimination (S.A.V.E.) technology for damping road vibration
  • BB30 bottom bracket enhances stiffness for efficient power transfer
  • Shimano 105 levers and derailleurs supply precise, dependable shifts throughout the 22 gears
  • TRP Spire disc brakes offer powerful braking with nuanced control for excellent performance in any condition
  • FSA Gossamer crankset and a wide-ranging 11-32 tooth cassette deliver a wide spread of gearing options for easy spinning no matter the gradient
  • Maddux RD2.0 wheels are wrapped with Schwalbe Lugano tires for low rolling resistance and grippy handling
  • Specs are subject to change


All bicycles sold at REI include a free warranty tune-up. New bikes go through a normal break-in period, after which readjustment is important for longevity and performance. Bring your new bike in to your local REI for its free tune-up within 20 hours of use or 6 months from purchase, whichever comes first. Contact your nearest REI bike shop to schedule this important service.

Free shipping & Assembly with REI Store Pickup

Cannondale bikes purchased on must be shipped to and picked up at REI stores which are authorized Cannondale dealers. The bikes are fully assembled and the shipping is free!

See the current list of REI stores which are authorized Cannondale dealers.

View all Cannondale Endurance Bikes

REI membership


Best Use Road Cycling
Frame 6061 aluminum
Fork S.A.V.E. carbon
Bike Suspension No Suspension
Crankset FSA Gossamer, 50/34
Bottom Bracket FSA BB30
Shifters Shimano 105
Front Derailleur Shimano 105
Rear Derailleur Shimano 105
Rear Cogs Shimano 105, 11-32, 11-speed
Number of Gears 22 gear(s)
Brake Type Mechanical Disc Brake
Brakes TRP Spire
Brake Levers Shimano 105
Rims Maddux RD 2.0 disc
Front Hub Formula CX 20
Rear Hub Formula Cx22
Wheel Size 700c
Tires Schwalbe Lugano, 700 x 25
Tire Width 25 millimeters
Handlebar Shape Drop Bar
Handlebar Cannondale C3 compact 6061 alloy
Stem Cannondale C3
Seat Post Cannondale C3
Saddle Cannondale Stage Ergo
Pedals Wellgo platform
Headset Synapse Si
Chain Shimano HG600
Weight 21 lbs. 5.4 oz.
Bike Weight Bike weight is based on median size, as sold, or the average of two median sizes.
Gender Unisex
Rated 5 out of 5 by from Awesome bike Fast, smooth and flawless. This bike is not a lot heavier than the carbon version but costs a whole lot less. I like the riding position, didn't like the seat which I changed out. Very agile and responsive.
Date published: 2016-04-11
Rated 5 out of 5 by from Sweet Ride!!!! Love this bike. It is a great ride. I have put just over a hundred miles on it and it rocks. Comfortable ride and still very responsive when you need speed.
Date published: 2016-09-12
Rated 5 out of 5 by from It's great bike I recommended him why it is great for the street it is very light and the design is incredibly excellent
Date published: 2017-02-11
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Would this bike be a good bike for a women? I'm 5"5 120 lb 

Asked by: Ml123
The key to find the proper bike frame size is by measuring your total inseam (not pant inseam) while wearing your cycling shoes, and then comparing it to the standover height of the bike. We attach sizing charts to every bike we sell on to help you determine the correct size and fit. For more information on sizing a bike and measuring your inseam, please click the following link:
Answered by: REIservice
Date published: 2017-03-02

How much weight does this bike support, I am planning to add a bike seat. Thanks

Asked by: jjg
​This bike has a maximum weight capacity of 285 pounds.
Answered by: REIservice
Date published: 2016-12-12

Why did the 2016 Synapse Alloy 105 Disc that was on clearance go up to the 2017 price even though it has the old 2016 components, not the 2017 upgrades TRP brakes?

Asked by: BobertS
​This bike is a 2016 model that was carried over to 2017. As we note in the last bullet point of details the specifications are subject to change. The brakes are the Promax Render R which was the original component for the 2016 model. The price fluctuation coincided with the bike being offered for 2016 then being carried over to 2017.
Answered by: REIservice
Date published: 2017-03-01

Does the frame have rack mounts to allow installation of a rear rack?

Asked by: Dsquare149
The Synapse Alloy 5 105 does not have the braze-ons on the seat stays for mounting a rear cargo rack. You can however purchase a rear cargo rack with rubber clamps that go around the seat stays. Also make sure that the rack is compatible with disc brakes.
Answered by: REIservice
Date published: 2017-03-27
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