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Few questions about geometry

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Few questions about geometry

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Old 03-25-07, 03:00 AM
  #1  
crimz
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Few questions about geometry

I've been asking a bunch of questions here for the past two days and I think I've been asking the wrong ones. I think these questions will help me a lot more than asking which bike to get.

What are bicycle geometries measured in? Most of the numbers don't say if they're using inches, cm, mm, etc.
For example http://www.khsbicycles.com/PDF/Frame_Geometry_AM_DJ.pdf
a lot of those don't say what they're measured in.

Also, for the different type of bikes(downhill, commuter, dj) what kind of general geometry should I be looking for?
For example: For an urban or dirt jumping would I generally want a shorter back end and smaller angles between the seat tube, head tube, and shorter top tube and seat tube lengths?
I understand preference also matters but I just want to get a general idea.

On freestyle bikes, I only really worried about the backends being short and the weight. The rest of the frame seemed pretty similar.
I thought it would be easy picking out a bike but the bigger bikes all look and feel different from each other. I basically want a freestyle/bmx bike with gears and bigger wheels. I think once I figure out how the geometry thing works I can pick out some bikes to try.

If I'm not being clear let me know.

Last edited by crimz; 03-25-07 at 03:06 AM.
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Old 03-25-07, 06:54 AM
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DeadSailor
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depending on the bike itll depend on what the measurements are in. road bikes are usually in mm and mtbs in inches. it SHOULD say what its using though

you have a pretty good gist of it. only thing ill add is headtube agles. the bigger the number the more 'mellow' the bike feels (pulls the front wheel farther foward). and lower the more 'quick' itll feel since it pulls it towards the back and shortens the wheelbase.

wouldnt say either one is the way to go.

good luck getting your bike and tell us what you end up getting!
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Old 03-25-07, 07:57 AM
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born2bahick
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The KHS numbers are mm, Online conversion tools bear out that 420mm = 16.5 inch seat tube measurement (A). for the small size frame. Good luck!
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Old 03-25-07, 04:20 PM
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crimz
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thanks a lot guys.
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