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PostPosted: Wed Nov 22, 2017 10:01 pm 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
Hi all
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.

Any advice or opinions most welcome. My head is wrecked trying to figure it out.

Thanks


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PostPosted: Wed Nov 22, 2017 11:05 pm 
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Location: Southern California
I'm 170cm and ride a 52mm Specialized Allez, Small TCR, and 50mm Oltre XR4. If i had to bet, I would say you're better off with the 47.

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2018 Bianchi Oltre XR4, (Celeste Matt)
2017 Giant TCR Advanced SL (Red)
2016 Specialized Allez DSW Sprint (Gold)


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Posted: Wed Nov 22, 2017 11:05 pm 


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PostPosted: Wed Nov 22, 2017 11:12 pm 
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Location: Brisbane
Why don't you book an appointment with a bike fitter to give you an opinion? That way, at least the fitter will take into account your actual physical requirements.

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PostPosted: Wed Nov 22, 2017 11:39 pm 
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What is your saddle height and setback on your current bike?


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PostPosted: Thu Nov 23, 2017 12:59 am 
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Posts: 15
Thanks guys

I was booked in but the guy cancelled and I need to place the order ASAP. But will try and get an appointment again. The 47 just looks so small. Nairo Quintana’s canyon is similar to the 51 bmc.


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PostPosted: Thu Nov 23, 2017 2:18 am 
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Joined: Wed Sep 06, 2017 1:40 am
Posts: 19
If it's any help, here's a comparison between the 47 and 51 cm frame sizes:

Code:
>>> import bmc
>>> with canvas():
     draw_bike(bmc.teammachine[2018][47])
     draw_bike(bmc.teammachine[2018][51])

Image


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PostPosted: Thu Nov 23, 2017 2:33 am 
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Location: Brisbane
Your diagram needs more detail.

A feint gridline or a vector for stems with 1cm increment notches or whatever.

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Scott Spark 720plus


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PostPosted: Thu Nov 23, 2017 3:14 am 
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Joined: Tue Feb 07, 2017 7:17 pm
Posts: 158
Location: Southern California
dcngr wrote:
Thanks guys

I was booked in but the guy cancelled and I need to place the order ASAP. But will try and get an appointment again. The 47 just looks so small. Nairo Quintana’s canyon is similar to the 51 bmc.


Nairo is 170cm.

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2018 Bianchi Oltre XR4, (Celeste Matt)
2017 Giant TCR Advanced SL (Red)
2016 Specialized Allez DSW Sprint (Gold)


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PostPosted: Thu Nov 23, 2017 3:23 am 
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I am 171 cm and I ride a 51cm BMC Roadmachine (with the low head cone it is similar to the Teammachine). I also tested the 51cm Teammachine which will have fit me.

I suppose you need a 47cm Teammachine.


BTRW Richie Porte is 172cm and rides a 47cm Teammachine.


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PostPosted: Thu Nov 23, 2017 6:46 am 
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Posts: 153
You can go either way. With the 47cm maximum saddle height is less than 70cm. If you’re requiring more than that height then 51cm is the way to go. I selected 47cm due to the reach but BMC is sending me a longer seatpost in order to accommodate my saddle height. Good luck!

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PINARELLO F8
PINARELLO F10
2018 BMC SLR01


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PostPosted: Thu Nov 23, 2017 7:29 am 
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I'm 173cm and I ride a 47 TMR02. I tried a 51 and it was too big for my taste


Sent from my iPhone using Tapatalk


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PostPosted: Thu Nov 23, 2017 10:04 am 
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Joined: Thu Mar 12, 2015 12:44 pm
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Location: Stockholm, Sweden
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…


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PostPosted: Thu Nov 23, 2017 11:02 am 
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Location: Melbourne, Victoria, Australia
I'm 181cm, 56cm for me BMC Team Machine SLR01 One on the way (usually 54cm in other brands *meant to be), but currently ride a 52cm giant (aggressive drop).

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PostPosted: Thu Nov 23, 2017 2:15 pm 
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Joined: Tue Oct 15, 2013 6:30 am
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Location: Gloucester, UK
Advice would be wait and get to see a fitter!
It's a lot of money to spend to end up with the wrong size!

The 47 is proper low on the front, so it's going to be racing style - so any neck/shoulder/arm/back issues/niggles, the 50 will be more comfortable than the 47

Having said all of the above, this is the weight weenies forum! the 47 will be lighter :D

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PostPosted: Thu Nov 23, 2017 10:14 pm 
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Joined: Wed Nov 22, 2017 9:46 pm
Posts: 15
Thanks everyone for your input, its great to get such excellent opinions.

Im hoping to get a fitting next week. Have slightly shorter legs at 74cm inseam.
My current bike setup is;
Seat tube 46.6................bmc 47- 42.3....................bmc 51...46.8
saddle height 66.5..........
top tube 53....................................51.7..................................53.5
head tube 14.5...............................11.3.................................13.3
seat angle 74...................................73.5................................73.5
Head angle 72.................................70.5..................................72
wheelbase 98..................................97.....................................97.5
dont have stack. .............................50.6..................................53
dont have reach ............................36.7..................................37.7
stand over height.............................72.6..................................75.4

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?
I read Nairo was 167cm tall? if the pros ride smaller bikes should we really? I just want to train and love climbs. I dont race but want a race feel.
Hopefully I'll get a clear answer soon with a fitting, its just a lot of money to get ti wrong so i really appreciate your advice.

Thanks
I


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Posted: Thu Nov 23, 2017 10:14 pm 


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