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56 vs 54cm Specialized Diverge

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56 vs 54cm Specialized Diverge

Old 06-24-20, 05:01 PM
  #1  
aquiver
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56 vs 54cm Specialized Diverge

Hello,
wondering if I should get a 56 or 54 cm specialized diverge. Can't test ride in my lbs right now, as due to covid they don't allow test-rides.
My height is 5'9.5
Inseam is 30.5
Armspan is 64.5 inches
I have short legs, short arms, and a long torso.

Any advice on sizing would be excellent.
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Old 06-24-20, 05:14 PM
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With a long torso I'd recommend a 56cm but there are so many variables that are unknown. I have a 31" inseam and a longer torso and arms and a 56 fits me perfectly. But mine is a Cannondale. I have 1" of clearance from my top tube and it feels comfortable to ride.
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Old 06-24-20, 05:35 PM
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I'd go with the smaller size.
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Old 06-24-20, 05:40 PM
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You can make a small bike bigger but you can't make a big bike smaller. If it were me, I'd get the 54 and run a longer stem and get a tighter triangle/better standover in the deal.
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Old 06-24-20, 05:54 PM
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Smaller 54. Your proportions are pretty normal iME.
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Old 06-24-20, 07:47 PM
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Originally Posted by nomadmax View Post
You can make a small bike bigger but you can't make a big bike smaller. If it were me, I'd get the 54 and run a longer stem and get a tighter triangle/better standover in the deal.
This. I'm 6 feet and ride a 56.
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Old 06-24-20, 08:03 PM
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Yep, Im 6 and ride a 56 Diverge. 31 inseam. I run a 90mm stem. Id vote 54.
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Old 06-24-20, 08:11 PM
  #8  
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I am 5'8.5 and have a 56cm bike that is just a little too big for me and although I can ride it, it never gets used. Go 54cm and use the bike more.

Last edited by sledgefisher; 06-24-20 at 09:11 PM.
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Old 06-24-20, 09:09 PM
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Sorry to be the naysayer here but go to the Specialized site and fit generator and it will come up with 56 which is what I would put you on. When I hear 6' foot people on 56 I have to ask who do they make the 62 cm bikes for, 8' tall people?
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Old 06-24-20, 10:24 PM
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Depends. You could probably ride either, depending on what youre looking for. I am almost exactly the same height and inseam as the OP, and while I fit fine on a 54, I found it very short front-to-back, and surprisingly upright, more so than my XC bike. The 56 was better, although still higher than I was expecting.
The Diverge just wasnt the bike I was looking for, I ended up on a 56cm Cannondale Synapse.
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Old 06-24-20, 10:24 PM
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Originally Posted by aquiver View Post
Hello,
wondering if I should get a 56 or 54 cm specialized diverge. Can't test ride in my lbs right now, as due to covid they don't allow test-rides.
My height is 5'9.5
Inseam is 30.5
Armspan is 64.5 inches
I have short legs, short arms, and a long torso.

Any advice on sizing would be excellent.
I'm 5'10" with a 31" inseam. 54" is the way to go here. You will have much more room to adjust in stem length, crank size and seat post height on a 54 than on a 56. You can get a 56 to work but the 54 will be lighter and have more adjustment.
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Old 06-25-20, 04:31 AM
  #12  
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In my youth I was 5' 10 1/2" with a 32.5" inseam. Down to 5' 9" but same inseam. I find a 54-55 is perfect. If my inseam was like yours I'd go no larger than a 54 and probably a 53. Be careful when buying a bike with a sloping TT. My CAAD 12 is a 53 but using virtual TT measurement it is actually a 55.
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Old 06-25-20, 05:06 AM
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Originally Posted by blakcloud View Post
Sorry to be the naysayer here but go to the Specialized site and fit generator and it will come up with 56 which is what I would put you on. When I hear 6' foot people on 56 I have to ask who do they make the 62 cm bikes for, 8' tall people?
I just did that. At 59 it comes back with 54. If you enter 510 it comes back 56. The OP should probably use their size calculator and enter the other measurements they ask for, not just height. Id be curious to see which they recommend.
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Old 06-25-20, 06:15 AM
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It is likely that both bikes can be adjusted to fit you just fine.
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Old 06-25-20, 08:22 AM
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Originally Posted by MattTheHat View Post
I just did that. At 59 it comes back with 54. If you enter 510 it comes back 56. The OP should probably use their size calculator and enter the other measurements they ask for, not just height. Id be curious to see which they recommend.
They actually recommended 52cm.
Measurements for knee to floor was 18 inches and ankle to floor was 3 inches.
I also measured some more and inputted information into competitvecyclist calculator although i'm not sure I measured everything correctly, and it gave me these frame specs:
https://imgur.com/tG1OcY0
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Old 06-25-20, 09:38 AM
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There is a tendency to ride smaller bikes as that's what the current pros ride. In days past seat posts only came in 180 cm lengths and road stems were horizontal to the ground. The typical MAMIL setup is a bike with a tall stack of spacers and a sharply angled stem rather than just buying a bike that is one size larger allowing a more stable ride and comfortable fit.
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Old 06-25-20, 09:52 AM
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Originally Posted by aquiver View Post
They actually recommended 52cm.
Measurements for knee to floor was 18 inches and ankle to floor was 3 inches.
I also measured some more and inputted information into competitvecyclist calculator although i'm not sure I measured everything correctly, and it gave me these frame specs:
https://imgur.com/tG1OcY0
Okay, interesting.
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Old 06-25-20, 09:58 AM
  #18  
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Short legs, long torso, size up to the 56 for the longer reach.
52....? don't be ridiculous
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Old 06-25-20, 11:06 AM
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I am almost exactly your dimensions and am very comfortable on the 54. These bikes have very relaxed geometries and while there has been a lot of discussion of reach I would be concerned that on the 56 the stack would be too high and put you overly upright. The Future Shock is not a pile of spacers that allow you to lower the stem. My recommendation is go with the 54 and change to a longer stem if you think you need it.
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Old 06-25-20, 11:36 AM
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Originally Posted by aquiver View Post
They actually recommended 52cm.
Measurements for knee to floor was 18 inches and ankle to floor was 3 inches.
I also measured some more and inputted information into competitvecyclist calculator although i'm not sure I measured everything correctly, and it gave me these frame specs:
https://imgur.com/tG1OcY0
I'm not sure where they are getting that, but you could actually use either. If you want your bars up higher, you may want to go with the 56. Both will work, both may need some adjustment. No big deal either way. When I got my Surly, I could have either used the 54 or 56. I went with the 56. I have less seat post showing than most, but I don't have to run a ridiculously high stack of spacers under the stem. I like the slightly longer wheelbase as well, the bike is extremely stable. Whichever way you go, see if you can get it with an uncut steerer. That way you can ride it a while and see where you want the bars, before cutting. I know you can get the Surly with an uncut steerer, but I had to tell the shop that is what I wanted.

Here is Specialized chart for the bike you are considering. You are on the cusp between 54 and 56.

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Old 06-25-20, 11:57 AM
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Originally Posted by aquiver View Post
Hello,
wondering if I should get a 56 or 54 cm specialized diverge. Can't test ride in my lbs right now, as due to covid they don't allow test-rides.
My height is 5'9.5
Inseam is 30.5
Armspan is 64.5 inches
I have short legs, short arms, and a long torso.

Any advice on sizing would be excellent.
Based on this, I would go for the 54.

I have very similar measurements (including armspan -- I just checked). I got a custom frame built, and it turned out to be almost identical to a 54cm Trek Domane. I know that isn't one you are looking at, but it might be a useful starting point.

This link, if it works correctly, should compare a 54cm Domane to the two sizes of Diverge you are considering:

https://geometrygeeks.bike/compare/t...arbon-2020-56/

I think you will find the reach too long with the 56, and the standover height too high.

Last edited by wgscott; 06-25-20 at 04:07 PM.
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Old 06-25-20, 03:53 PM
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I am 6 feet tall and ride a 58cm Diverge. It's a great fit and very comfortable. Based on that, I'd think the 56 would be a better fit for you. But I'd also be reluctant to buy without trying it out first.
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Old 06-25-20, 05:07 PM
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Im the same height and inside leg and Im very happy with the 56 frame on my 2018 Diverge.
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Old 06-25-20, 05:42 PM
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Originally Posted by blakcloud View Post
Sorry to be the naysayer here but go to the Specialized site and fit generator and it will come up with 56 which is what I would put you on. When I hear 6' foot people on 56 I have to ask who do they make the 62 cm bikes for, 8' tall people?
Inseam not height is a better metric for proper fit.
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Old 06-25-20, 05:45 PM
  #25  
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Originally Posted by velopig View Post
There is a tendency to ride smaller bikes as that's what the current pros ride. In days past seat posts only came in 180 cm lengths and road stems were horizontal to the ground. The typical MAMIL setup is a bike with a tall stack of spacers and a sharply angled stem rather than just buying a bike that is one size larger allowing a more stable ride and comfortable fit.
Back in the day...the pros rode the smallest frame that work because they were lighter.
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