Help understand geometry reach and stack

Discuss light weight issues concerning road bikes & parts.
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blantonator
Posts: 115
Joined: Sat Oct 23, 2010 8:36 pm

by blantonator

I'm currently riding a 52cm Spooky Skeletor and after a recent fitting a 120mm stem with quite a few spacers(4cm). I'm looking at a new frame, Super Six or a possibly a Madone, depending what the team orders.

Looking at a 52 in the Cannondale and Trek, both have similar reaches 37.8 and 37.9cm, but the Trek has a 2cm higher head tube. With equal stem placements how much longer is the Trek vs the Cannondale. Also, with a 52cm Spooky what stem length would I need with the Cannondale and Trek to get my bars in the right place.

Here are the respective geometries.

Spooky Image
Dale Image
Trek Image

Thanks

by Weenie


cyclenutnz
Posts: 763
Joined: Tue Jul 18, 2006 5:18 am
Location: Cambridge, New Zealand
Contact:

by cyclenutnz

Set up comparison
Image
http://www.speedtheory.co.nz
http://www.velogicfit.com - 3D Motion Capture and Frame Finder Software

ajmit3
Posts: 205
Joined: Sun Mar 27, 2011 7:36 am

by ajmit3

Woah Cyclenutz - how did you do that ? Can you share the spreadsheet ! Awesome work btw....

blantonator
Posts: 115
Joined: Sat Oct 23, 2010 8:36 pm

by blantonator

Yes! Thank you. It looks like stack only affects reach by a few mm.

upside
Posts: 601
Joined: Fri Mar 09, 2007 1:26 am
Location: USA

by upside

Me toooo. I am in almost the same situation between bikes. I would be more than happy to PayPal you some $$$ to get my answer.

by Weenie


cyclenutnz
Posts: 763
Joined: Tue Jul 18, 2006 5:18 am
Location: Cambridge, New Zealand
Contact:

by cyclenutnz

I'm happy to post up quick comparisons like this (if I see the question). Or, given I am a bike fitter, I do offer a bike options report (that I charge for) where I go into detail on bikes you are (or should be) considering.
http://www.speedtheory.co.nz
http://www.velogicfit.com - 3D Motion Capture and Frame Finder Software

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