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 Post subject: Stem calculation.
PostPosted: Wed Feb 03, 2016 1:34 am 
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Joined: Fri Jun 06, 2014 4:27 am
Posts: 45
Just wondering what tool people are using now yojimg appears to be dead. Wanting to work out if a bike with a 30mm taller 10mm shorter stack/reach can be worked out fit wise for a new training bike (new gen 58cm Tarmac > Diverge) Tarmac has 10mm spacers above the top cap if this helps, I'm guessing slammed with a -17 will get it close.

TIA.
Aaron.

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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 2:05 am 
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Joined: Mon Aug 17, 2015 4:03 pm
Posts: 209
Location: Chicago, IL, USA
Spreadsheets... Google Doc to be specific:

Image

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 Post subject: Re: Stem calculation.
Posted: Wed Feb 03, 2016 2:05 am 


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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 2:09 am 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7874
Location: Los Angeles / Glendale, California
There is a spreadsheet doc which exists here on this forum (somewhere) that calculates Stack & Reach, taking into account stem height, length, angle, etc... you can compare between two bikes this way and make adjustments as necessary. You will need to figure out your own reach due to the handlebar change as well, that is not in the calculator.

I'll upload it when I get home unless somebody else can upload it before me. :D

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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 2:23 am 
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Joined: Mon Aug 17, 2015 4:03 pm
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Location: Chicago, IL, USA
Assuming current set up:
2016 Tarmac S-Works rim
size = 58
stem = -3 deg / 110mm
steerer top cap + spacer stack height = 15mm
Handle bar mounting stack = 650.24mm
Handle bar mountain reach = 499.02mm


This will have the equal handle bar stack and reach:
2016 Diverge Pro
Size = 58
stem = -17 deg / 120mm
steerer top cap + spacer stack height = 10mm
Handle bar mounting stack = 651.66mm
Handle bar mountain reach = 501.97mm

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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 2:44 am 
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Joined: Mon Aug 17, 2015 4:03 pm
Posts: 209
Location: Chicago, IL, USA
Image

The yellow cells are the inputs. Since I'm not sure what your exact set up is, I only guessed.

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 Post subject: Stem calculation.
PostPosted: Wed Feb 03, 2016 3:45 am 
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Joined: Sun Aug 08, 2010 5:12 am
Posts: 164
Location: Brasil
Someone posted this in other topic. I dont know if is what you want

http://ttbikefit.com/stemcalc.html

Edit: topic source @CBJ post


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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 4:38 am 
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Joined: Fri Jun 06, 2014 4:27 am
Posts: 45
Thank you everyone, I appreciate the help. Anyone have the link to the google doc? I'm on tapatalk at present and can't seem to locate it..
At the moment im running a 120mm -6 stem on 10mm of spacers so a 130mm -17 without spacers should match if I'm not mistaken. :) Basically tempted to make the change to have an all weather training bike that can take 35mm tyres and fenders with ease but not lose too much of what I like about my Tarmac disc.

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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 5:28 am 
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Joined: Mon Jan 31, 2011 2:41 am
Posts: 149
Location: SF Bay Area
Is this the one?

http://bb2stem.blogspot.com


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 Post subject: Re: Stem calculation.
PostPosted: Wed Feb 03, 2016 6:05 am 
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Joined: Mon Aug 17, 2015 4:03 pm
Posts: 209
Location: Chicago, IL, USA
nefariousintent wrote:
... 120mm -6 stem on 10mm of spacers ...

10mm of spacers, does that include headset top cap? Those are usually 15mm, so total stack height would be 25mm.


SlamThatStem top cap (1.85mm) may be needed for the Diverge depending on what stem you can get. Not sure if they make one that'll fit Diverge's headset though.

Specialized's multi stem may be the most practical option, since they offer angle range from 8 to 28 deg.

Image

btw this is my own spreadsheet, not sure if that's what you were asking for. PM me if interested.

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Specialized Allez Gold ~ viewtopic.php?f=10&t=134419


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 Post subject: Re: Stem calculation.
PostPosted: Thu Feb 04, 2016 3:11 am 
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Joined: Wed Oct 31, 2007 10:32 pm
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Location: Los Angeles / Glendale, California
nlouthan wrote:


Yes.

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 Post subject: Re: Stem calculation.
Posted: Thu Feb 04, 2016 3:11 am 


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