Cannondale Synapse Carbon 105

4.0 stars
 (5 Reviews)
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Cannondale's Synapse Carbon 105 is a true endurance machine. The slightly slacker head angels, slightly longer wheelbase, and slightly taller head tube stack height than Cannondale's racier bikes offer increased comfort and stability on all road surfaces, while maintianing a racy feel. The seat tube splits asymmetrically to meet the wide bottom brackst for a maximum stiffness and minimal weight. The flattened and helixed-shaped rear stays flex to absorb shock and keep the wheel tracking smoothly over bumps, while the 25.4mm seat post and seat tube deflect slightly for increased comfort. Shaped fork blades and offset dropouts allow the front wheel to track smoothly over rough surfaces for amazing comfort and control.

With Shimano's always-reliable 105 component group, you'll instantly slip into the gear you need with the range to scale any climb. Tektro brakes deliver controlled braking on the way down for the utmost in descending confidence. Cannondale's C3 aluminum components outfit this trustworthy machine, while Cannondale’s Stage Ergo saddle provides comfort and support all day long.

Features & Info

Geometry chart

Cannondale Synapse carbon geometry chart
Pedals sold separately

Consumer Reviews

4.0 stars

(5 reviews)

40% of respondents would recommend this to a friend.


  • Comfortable 
  • Great For Endurance Rides 
  • Quick 
  • Quick With Minimal Effort 
  • Saddle Is Very Comfortabl 
  • Very "sharp"looking Bike 


  • Creaky Noisy 
  • None So Far 

Best Uses

  • Training  (2)
  • All Around Fun Rides 
  • Endurance Rides 
  • Group Rides 
  • Climbs 
  • Long Rides 

Nov 22, 2016

Never again ....... Cannondale Synapse

Best Uses:
105's absolutely the best. Frame a real problem. Took this bike back and eventually was given a replacement. Same issue they replaced it with the Specialized Roubaix no problems. Disappointing!
by whiskeyrunner from Ellicott City md

Nov 06, 2016

Creaks, creaks, and more creaks

Creaky Noisy
Best Uses:
I bought this to replace my 2012 Synapse Alloy....BIG mistake. Since purchasing two months, I have taken the bike back twice for a noisy bottom bracket, and four times to find a creaking noise in the seat post area and stem. On the last two visits, the mechanic took out the wedge assembly for the seat post, heavily greased it and said that it should be fixed. The next day, twenty minutes into my ride, the noise came back. I will be taking the bike back in tomorrow to fix again and after that, I'm selling it. It rides nicely, but after a while the aggravation and worry about the creaking overcomes the fun of the ride.
by HavanaJoe from Tampa, FL

Oct 31, 2016

First ever carbon bike

Best Uses:
My first carbon road bike after so many years on a Cannondale quick hybrid. This bicycle is perfect for going on long distance rides as well as being on roads that are not as smooth as desired. Great bicycle for those who want to get into cycling without spending too much but at the same time still have fun.
by Randy from Los Angeles, CA

Jul 12, 2016

Great deal on an excellent all-round bike

Lightweight, 105 Components, Quick, Comfortable
Best Uses:
Training, Climbs, Long Rides
I bought this bike from Helen's two months ago and have 1600 kilometres on it now, split between commutes and longer weekend rides. It is everything I could have hoped for. The carbon frame makes long rides on bumpy roads and fast descents so much better than my old (perfectly adequate) aluminum Trek 1.5, and the components are perfect for what I want -- really, the 105 is great for all-around use. The gearing range (from 50:11 to 34:32) is wonderful; even if you are macho you probably wish for a bailout gear on occasion. Of course everyone wants the new disk brake version, so this bike has now become a screaming deal. And really, the brakes are fine.
by RobF from Marina del Rey, CA

Mar 21, 2016

Great road endurance bike!

Great For Endurance Rides, Very "sharp"looking Bike, Quick With Minimal Effort, Surprisingly Light, Saddle Is Very Comfortabl
None So Far
Best Uses:
All Around Fun Rides, Training, Endurance Rides, Group Rides
This is my first Carbon fiber bike and I am more impressed with this bike every time out! I used to struggle on hills with my aluminum bike but now I take them rather easily!
by ride addict from River Vale, NJ


Synapse, BallisTec Carbon, Di2 ready, SAVE PLUS, BB30a
Synapse Disc, SAVE PLUS, BallisTec Carbon
Synapse Si, 1-1/4" lower bearing, 25mm top cap
RS 2.0 Disc
Front: Formula RB-56
Rear: Formula RB-5711
Stainless steel, 14g
Schwalbe Lugano, Folding, 700 x 25c
Cannondale Si, BB30a
FSA, 50/34
Bottom Bracket
FSA BB30 bearings
Shimano HG601
Front Derailleur
Shimano 105, braze-on
Rear Derailleur
Shimano 105 GS
Cassette/Rear Cogs
Shimano 105, 11-32: 11-speed
Shimano 105
Cannondale C3, butted 6061 Alloy, Compact
Cannondale Grip Bar Tape w/Gel, 3.5mm
Cannondale C3, 6061 Alloy, 31.8, 6 deg.
Brake Levers
Shimano 105
Tektro R741, dual pivot, cartridge pad
Cannondale Stage Ergo
Seat Post
Cannondale C4, 6061 Alloy, 25.4mm