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How to correctly measure a frame

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JUGGARNAUT:
Check it out here;

How to correctly measure a frame

Scuffy:
Nice link Juggs.

I wish I was a more experienced rider and that I had some welding knowledge as I have been thinking alot lately about flatland frame geometry.

Like some people have a preferred chainstay length and some have a preferred top tube length and some have a preferred seat tube or head tube angle.

I've been thinking about finding all the different measurements that seem best to a given rider.

Like how would a frame with a 19" toptube and a really short chainstay feel like,or a frame with an short toptube but long rear end...then factor in BB heights,wheelbase (due to forks being offset or not) head tube and seat tube angle....I'll have to buy a sh*t ton of bikes just to figure all that out...the possibilities are almost endless.

I've heard some people talk before about how their frames have the same toptube lengths but when they try the others bike it feels too short or long to them....they obviously didn't realize that there's more to it then just toptube length,but also head tube and seat tube angles etc.

A frame has a 19" toptube,71 degree seat tube angle and a 75 degree head tube angle and B frame has a 19" toptube,74 degree seat tube angle,and 73 degree head tube angle...hmmm,I wonder which frame would have alonger feeling front end...Bike A I would think.

kkmk:

--- Quote from: Scuffy on June 29, 2010, 06:26:10 AM ---A frame has a 19" toptube,71 degree seat tube angle and a 75 degree head tube angle and B frame has a 19" toptube,74 degree seat tube angle,and 73 degree head tube angle...hmmm,I wonder which frame would have alonger feeling front end...Bike A I would think.

--- End quote ---

Bike B will be much longer.

smiley (Roy):

--- Quote from: kkmk on June 29, 2010, 12:56:03 PM ---
--- Quote from: Scuffy on June 29, 2010, 06:26:10 AM ---A frame has a 19" toptube,71 degree seat tube angle and a 75 degree head tube angle and B frame has a 19" toptube,74 degree seat tube angle,and 73 degree head tube angle...hmmm,I wonder which frame would have alonger feeling front end...Bike A I would think.

--- End quote ---

Bike B will be much longer.

--- End quote ---

It depends are the standover dimensions the same on both frames ? The bike with the taller standover will have a longer front end...

Measuring frames by toptube length does not work with the way frames are currently built. There are too many variables not taken into consideration. Once upon a time you could compare two frames by toptube length (when toptubes were horizontal).
 
-Roy

Paradoxium:
I always thought tt length was measured from the centre of the headtube to the centre of the seattube, not along the actual tube itself. Great link nonetheless. ;)

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