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PostPosted: Thu Nov 23, 2017 10:27 pm 
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Posts: 364
MayhemSWE wrote:
dcngr wrote:
Im ordering a bmc teammachine slr 01. Its my first real competitive bike. Can't decide between 47 or 51. Im 166cm tall. Im using the competitive cyclist fit calculator and then using Ridley website for stack and reach. Im border line between the two. I've heard the smaller size could prove to cause neck and shoulder stress and go for the 51 for longer term comfort.

We don't know anything about your riding style, flexibility or body proportions. In general though I'd say if you have longer legs (compared to your total body length) you will probably want to go for the smaller frame size and corresponding shorter reach, while if you have short legs and a longer upper body you will probably want the longer reach of the larger frame size. Of course whether you have T-rex or orangutang arms will also be a factor…


I would say the exact opposite. The stack changes more substantially than the reach. 1cm more reach but 2.4cm more stack on the 51. If you have long legs for your height and aren't super flexible you would have too much drop on a smaller bike.


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PostPosted: Thu Nov 23, 2017 10:33 pm 
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Location: Brisbane
You should be on the 51, unless your fit on your existing bike is all wrong.

A S defy alu has a standover of about 75.4cm as well.

_________________
Chapter 2 Tere
Scott Spark 720plus


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Posted: Thu Nov 23, 2017 10:33 pm 


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PostPosted: Thu Nov 23, 2017 10:41 pm 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
morganb wrote:
MayhemSWE wrote:
dcngr wrote:
Im ordering a bmc teammachine slr 01. Its my first real competitive bike. Can't decide between 47 or 51. Im 166cm tall. Im using the competitive cyclist fit calculator and then using Ridley website for stack and reach. Im border line between the two. I've heard the smaller size could prove to cause neck and shoulder stress and go for the 51 for longer term comfort.

We don't know anything about your riding style, flexibility or body proportions. In general though I'd say if you have longer legs (compared to your total body length) you will probably want to go for the smaller frame size and corresponding shorter reach, while if you have short legs and a longer upper body you will probably want the longer reach of the larger frame size. Of course whether you have T-rex or orangutang arms will also be a factor…


I would say the exact opposite. The stack changes more substantially than the reach. 1cm more reach but 2.4cm more stack on the 51. If you have long legs for your height and aren't super flexible you would have too much drop on a smaller bike.



So with shorter legs go for the 47 as the stack is shorter?


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PostPosted: Thu Nov 23, 2017 10:54 pm 
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Location: Brisbane
dcngr wrote:


So with shorter legs go for the 47 as the stack is shorter?


only if you are flexible enough. If you want to get the 47 and set it up identical to your defy, you're going to end up with a ~45mm stack of spacers.

_________________
Chapter 2 Tere
Scott Spark 720plus


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PostPosted: Thu Nov 23, 2017 11:01 pm 
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Posts: 15
silvalis wrote:
dcngr wrote:


So with shorter legs go for the 47 as the stack is shorter?


only if you are flexible enough. If you want to get the 47 and set it up identical to your defy, you're going to end up with a ~45mm stack of spacers.



thanks. have decent flexibility, the feeling i have with current bike is i just wish my hoods were a bit further back.


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PostPosted: Thu Nov 23, 2017 11:06 pm 
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Location: Brisbane
dcngr wrote:
silvalis wrote:
dcngr wrote:


So with shorter legs go for the 47 as the stack is shorter?


only if you are flexible enough. If you want to get the 47 and set it up identical to your defy, you're going to end up with a ~45mm stack of spacers.



thanks. have decent flexibility, the feeling i have with current bike is i just wish my hoods were a bit further back.


Reach can be adjusted within reason with stem length. The fitter will do that, just tell them you feel you are too stretched out.

_________________
Chapter 2 Tere
Scott Spark 720plus


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PostPosted: Fri Nov 24, 2017 4:54 am 
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Posts: 19
dcngr wrote:
based on the stand over height I think it has to be the 47. The 51 is very close to my current bike which is an entry level giant defy by the way which is compact with a sloping top tube. So how do i compare?

Link me the geometry chart of your current bike and I'll add it to my bikegeo tool, and will compare all three frames for you.

Also what's your current cockpit setup? Spacers + stem angle + stem length


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PostPosted: Fri Nov 24, 2017 9:07 am 
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Joined: Fri Jan 21, 2011 5:27 pm
Posts: 112
I would say size 47.

I’m 169cm and ride a 48 2015 teammachine. 675 saddle height. Id be in between sizes in the 2018 team machine and would hesitate to go to a 51.

The 47 stack height may look low but look at the head angle-it’s pretty slack which means your bars will end up higher because the stem will be pointing up more than the 51, if that makes sense? Nothing worse than having your bars too high.

Ritchie Porte is on the 47 as someone mentioned and he doesn’t look too big on it but he’s real skinny.


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PostPosted: Fri Nov 24, 2017 2:23 pm 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
saba wrote:
dcngr wrote:
based on the stand over height I think it has to be the 47. The 51 is very close to my current bike which is an entry level giant defy by the way which is compact with a sloping top tube. So how do i compare?

Link me the geometry chart of your current bike and I'll add it to my bikegeo tool, and will compare all three frames for you.

Also what's your current cockpit setup? Spacers + stem angle + stem length



wow Thanks a mil!
If it helps here is a link to current bike specs https://www.giant-bicycles.com/us/defy-3-2011 , its all i have, no reach or stack on it.
Stem is 60, can't remember angle, took spacers out to get as low as possible. 42 bars, saddle height 66.5.


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PostPosted: Fri Nov 24, 2017 11:42 pm 
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Posts: 19
Comparing your current setup with a Teammachine 47 (in blue) and Teammachine 51 (in red), with the following assumptions:

  • 170mm cranks (stock for BMCs),
  • Defy Small with 60mm stem, -6 degree, 25mm of cockpit stack,
  • Teammachine 47 with 90mm stem, -8 degree, 25mm of cockpit stack (stock),
  • Teammachine 51 with 100mm stem, -8 degree, 25mm of cockpit stack (stock),

then you get something like this:
Image
Image

The 51 is closest to your current frame size, however, you're running a very short stem on your endurance bike, and the Teammachine is a thoroughbred race bike with aggressive geometry. Out of the box, both the 47 and 51 will be lower and longer than your current bike. Eyeballing suggests the 51 may be better. I'll let you decide with your fitter based on the second image which suits you better. Maybe the 47 with enough spacers will match the reach of your Defy?


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PostPosted: Sat Nov 25, 2017 9:15 am 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
saba wrote:
Comparing your current setup with a Teammachine 47 (in blue) and Teammachine 51 (in red), with the following assumptions:

  • 170mm cranks (stock for BMCs),
  • Defy Small with 60mm stem, -6 degree, 25mm of cockpit stack,
  • Teammachine 47 with 90mm stem, -8 degree, 25mm of cockpit stack (stock),
  • Teammachine 51 with 100mm stem, -8 degree, 25mm of cockpit stack (stock),

then you get something like this:
Image
Image

The 51 is closest to your current frame size, however, you're running a very short stem on your endurance bike, and the Teammachine is a thoroughbred race bike with aggressive geometry. Out of the box, both the 47 and 51 will be lower and longer than your current bike. Eyeballing suggests the 51 may be better. I'll let you decide with your fitter based on the second image which suits you better. Maybe the 47 with enough spacers will match the reach of your Defy?



This is amazing! thanks so much for taking the time to do this. Im definitely looking for more race geometry, i just find it hard to get low on my bike, i have to force it. Will run this by the fitter, this is excellent :beerchug: thanks again!!


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PostPosted: Sat Nov 25, 2017 9:56 am 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
Attachment:
protos20181.gif
protos20181.gif [ 45.14 KiB | Viewed 369 times ]
dcngr wrote:
saba wrote:
Comparing your current setup with a Teammachine 47 (in blue) and Teammachine 51 (in red), with the following assumptions:

  • 170mm cranks (stock for BMCs),
  • Defy Small with 60mm stem, -6 degree, 25mm of cockpit stack,
  • Teammachine 47 with 90mm stem, -8 degree, 25mm of cockpit stack (stock),
  • Teammachine 51 with 100mm stem, -8 degree, 25mm of cockpit stack (stock),

then you get something like this:
Image
Image

The 51 is closest to your current frame size, however, you're running a very short stem on your endurance bike, and the Teammachine is a thoroughbred race bike with aggressive geometry. Out of the box, both the 47 and 51 will be lower and longer than your current bike. Eyeballing suggests the 51 may be better. I'll let you decide with your fitter based on the second image which suits you better. Maybe the 47 with enough spacers will match the reach of your Defy?



This is amazing! thanks so much for taking the time to do this. Im definitely looking for more race geometry, i just find it hard to get low on my bike, i have to force it. Will run this by the fitter, this is excellent :beerchug: thanks again!!


No worries if im pushing my luck here but just our of curiosity would you mind adding in the 47 and 49 of the protos attached here, just to compare against a totally different bike?


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PostPosted: Sat Nov 25, 2017 10:00 am 
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Joined: Mon Jan 23, 2017 8:05 am
Posts: 153
I’m excited bc today my 47cm SLR01 arrived. Good luck with your choice of size.

_________________
S-WORKS VENGE 1ST GEN
PINARELLO F8
PINARELLO F10
2018 BMC SLR01


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PostPosted: Sat Nov 25, 2017 10:10 am 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
PinaF8 wrote:
I’m excited bc today my 47cm SLR01 arrived. Good luck with your choice of size.



:D :D :D
Ah fantastic!! Congrats, a great day for you!
Can you post some pics?

47? Can you tell me your height?
Excited for you!!


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Posted: Sat Nov 25, 2017 10:10 am 


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PostPosted: Sat Nov 25, 2017 2:46 pm 
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Joined: Mon Jan 23, 2017 8:05 am
Posts: 153
dcngr wrote:
PinaF8 wrote:
I’m excited bc today my 47cm SLR01 arrived. Good luck with your choice of size.



:D :D :D
Ah fantastic!! Congrats, a great day for you!
Can you post some pics?

47? Can you tell me your height?
Excited for you!!



I’m 170cm and BMC included a longer seat post to accommodate my 70cm saddle height. I could’ve gone with 51cm but the TT was at 53.5cm which will exceed my liking.

_________________
S-WORKS VENGE 1ST GEN
PINARELLO F8
PINARELLO F10
2018 BMC SLR01


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