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Cannondale Synapse Size

Old 05-03-19, 02:42 AM
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cemark
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Cannondale Synapse Size

I found two Synapse that I am interested in but cant decide which one to buy because of financial matters.

Cannondale Synapse Carbon Disc Ultegra 3 2016 . size 48, $1900
Synapse Carbon Disc SE Ultegra 2016 size 2918 $2500

I am 1.73m with 77 cm inseam.

I have tried Specialized Roubaix Comp 54 and it was a good fit but it was over my budget.
Cannondale's frameset has a little bit smaller geometry. Probably 51 fits me better but I wonder if I can manage to ride the 48 with stem adjustments. $600 helps a lot but i dont want to sacrifice the comfort for $600 which was the reason I decided buying synapse for the comfortable ride and upright position.
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Old 05-03-19, 05:45 PM
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You will need a 54 in a Synapse frame as well. 51 is going to be too small.
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Old 05-04-19, 01:35 AM
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48 is definitely too small. 51 might be OK. I am 5'6" with 29" inseam and the 51 Synapse was the best fit. It's not the reach that is the issue; the knees will be a tight fit between the handlebars. I don't know if the frame size has changed much, but you really should try both sizes to determine which one fits better.
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Old 05-04-19, 04:22 AM
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I think 48 is too small too. I just wanted to see if someone somehow managed to make it a good fit with some adjustments. Now I have to decide between Synapse Ultegra Disc SE ($2500) and Synapse 105 Caliper ($1600). Both of them size 51. I like the Ultegra version more than the 105 version because of the color and to be able to replace the tires with 32mm for harsh road rides. BUT $900 difference is not something to be overlooked. Also the braking power of Ultegra disc vs 105 calipers makes me think twice which one to choose.
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Old 05-07-19, 01:41 PM
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I tried both 48 and 51. Both of them were comfortable but I had to raise the seatpost really high which didn't look so nice and 51 was a little bit more upright. Also I liked the color scheme of Se Ultegra better. At the end I bought the 51 Synapse Se Ultegra Disc. Awesome bike. Financially I will be broke for a long time but still it worth it...I guess. Time will tell.
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Old 05-07-19, 03:04 PM
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1.73m = 5ft8 is a solid medium, which to Cannondale is a size 54. I'm 5ft9 and I'm usually in the middle to top of medium depending on who made the bike.
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Old 05-07-19, 04:43 PM
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Cemark, you must have a short torso to fit the 51cm frame comfortably. If you were at my shop I would have at least tried a 54cm Synapse. The bike is a fantastic design, ride the wheels off of it!
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Old 05-08-19, 07:51 AM
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I don't know if this applies to your situation but let me share some of my experience. I have a 32.5" inseam and am 5'9". I can ride a variety of traditional frame sizes from 54-56. I recently bought a CAAD 12 in a 52. But, when you measure it using C to C along the virtual TT it is actually a 54. It fits perfectly. I did swap out the 90 mm stem for a 100 mm and could also use a 110mm. My suggestion is to try to ride whatever you are looking at. I use the LeMond - Guimard formula of .665 X inseam to size my bikes. In your case that would come to a 51 or thereabouts.
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Old 05-08-19, 02:00 PM
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Isn't the LeMond formula .883?
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Old 05-09-19, 12:08 PM
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We made a bike fit with the salesman at the Specialized shop. According to my body measurements (which was made with the rider sizing station) it showed 54 was the perfect fit for me. And according to Cannondale Synapse geometry chart it comes up to 51 for Cannondale. I wanted to give size 48 a try just because of the 700$ difference. It wasn't so bad. I think I would be able to ride that but Synapse SE is something else. Full Ultegra set, being able to put 32mm tires, amazing color...I have riden only 10 km so far but it was a really comfortable ride.
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Old 05-09-19, 12:14 PM
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Originally Posted by Darth Lefty View Post
1.73m = 5ft8 is a solid medium, which to Cannondale is a size 54. I'm 5ft9 and I'm usually in the middle to top of medium depending on who made the bike.
Unfortunately they didnt have 54 at their stock. I would have to go to another city to try that. So I gave it a try with 48 and 51 and ended up buying the 51. You are right. This is an amazing bicycle. Looks good, accelerates really fast, really smooth gear changing, solid components. I exceed my budget but worths every penny.
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Old 05-09-19, 02:08 PM
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I am 5'11, 32" inseam and ride a 54cm Cannondale. It's OK fit for me, I've no problems doing 40-50mi rides on it, but I did put a bit longer stem on it (+10mm over stock)
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Old 05-10-19, 01:01 PM
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Originally Posted by TiHabanero View Post
Isn't the LeMond formula .883?
I think that's seat height but I'll check. Using the .883, with my 32.5" inseam my frame size would be a 73.
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Old 05-10-19, 01:03 PM
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Originally Posted by autonomy View Post
I am 5'11, 32" inseam and ride a 54cm Cannondale. It's OK fit for me, I've no problems doing 40-50mi rides on it, but I did put a bit longer stem on it (+10mm over stock)
That sound about exactly right to me.
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Old 05-10-19, 01:05 PM
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Originally Posted by cemark View Post
Unfortunately they didnt have 54 at their stock. I would have to go to another city to try that. So I gave it a try with 48 and 51 and ended up buying the 51. You are right. This is an amazing bicycle. Looks good, accelerates really fast, really smooth gear changing, solid components. I exceed my budget but worths every penny.
I'll bet that if you measure the frame using the virtual intersection of TT it will be close to a 54. Just a guess though.
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Old 05-10-19, 01:10 PM
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Just checked the Cannondale geometry and I think the 51 is an actual 53.
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Old 05-10-19, 01:22 PM
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Bruce19, my wife is certainly right. I am wrong about everything. .883 is indeed the saddle height factor. Oops!
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Old 05-11-19, 04:27 AM
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Originally Posted by TiHabanero View Post
Bruce19, my wife is certainly right. I am wrong about everything. .883 is indeed the saddle height factor. Oops!
Don't tell mine. She won't believe I wasn't wrong.
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