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 Post subject: Stack and Reach question
PostPosted: Wed Aug 30, 2017 8:11 pm 
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Joined: Sun Aug 06, 2017 12:37 am
Posts: 24
I'm trying to determine the stack and reach of my current frame, a 2008 Look 586 size XL.

can anyone help me?

I think I calculated the reach at 408 mm , but this seems too long.

The geometry chart does not have it listed:

Image


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PostPosted: Wed Aug 30, 2017 8:27 pm 
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Location: Romania
Sounds right, b-e. Seems normal for an xl. Giant tcr xl is 412.


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Posted: Wed Aug 30, 2017 8:27 pm 


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PostPosted: Wed Aug 30, 2017 8:35 pm 
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how about the stack?


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PostPosted: Wed Aug 30, 2017 8:49 pm 
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Based on that chart, I calculated:

stack: 580mm
reach: 398mm

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PostPosted: Wed Aug 30, 2017 8:54 pm 
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Thank you so much!! I knew I was off a bit.


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PostPosted: Wed Aug 30, 2017 8:55 pm 
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Hiya, I wholeheartedly recommend the Velogic Fit app... registration is free and the "bike comparison tool" is also free... it is very helpful when comparing bikes, as the database seems to be quite up to date...

I put in your Look, the app says: Reach 398, Stack 581

All other measurements are there too...


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PostPosted: Thu Aug 31, 2017 7:40 am 
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Lookryder wrote:
Thank you so much!! I knew I was off a bit.

You know it's very easy to physically measure it as well, right? All you need is a flat floor, vertical wall and a tape measure...


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PostPosted: Thu Aug 31, 2017 8:18 pm 
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wingguy wrote:
Lookryder wrote:
Thank you so much!! I knew I was off a bit.

You know it's very easy to physically measure it as well, right? All you need is a flat floor, vertical wall and a tape measure...


I know. I did meausre it myself several times and the repeatability of the measurements was not good enough for me; it would vary by a few mm every time. I wanted to know what was listed on the the geo chart as I'm trying to find a frame of similar stack and reach. The more data the better.


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PostPosted: Thu Aug 31, 2017 8:21 pm 
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But in the above chart doesn't B' show reach?


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PostPosted: Thu Aug 31, 2017 8:36 pm 
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Valbrona wrote:
But in the above chart doesn't B' show reach?


B' is actual top tube length. Frame reach is B minus E.


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PostPosted: Thu Aug 31, 2017 9:36 pm 
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mike001100 wrote:
Hiya, I wholeheartedly recommend the Velogic Fit app... registration is free and the "bike comparison tool" is also free... it is very helpful when comparing bikes, as the database seems to be quite up to date...


Just a note on using the database - if you scroll to the bottom of the frame specifications you'll see the 'Calculated Measures' field. Which tells you which metrics I've had to calculate.
In the case of the 586 - that's wheelbase, reach and stack. I have a very robust algorithm for doing that and Look provide really good information on other measures, so there is pretty high confidence. But there is a little more uncertainty than if the manufacturer had provided the XY data.

Having said that, I frequently find errors in the geometry charts of large companies that make a lot of noise about bike fit. So the overall standard of the database is more reliable than other sources.

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Posted: Thu Aug 31, 2017 9:36 pm 


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PostPosted: Fri Sep 01, 2017 12:23 pm 
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TobinHatesYou wrote:
Valbrona wrote:
But in the above chart doesn't B' show reach?


B' is actual top tube length. Frame reach is B minus E.


Keep in mind that if you measure reach doing this, the geo chart indicates that it is measured to the centre/centre intersection of the top tube/head tube junction. Typically reach/stack is measured to the centre of the top of the headtube.

So to compare to others measured as above, you'd need to also look at the headtube measurements (K, KO), read the ht angle, do a bit of trig and subtract a few mm...

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