Effective top tube?

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lulubel

Über Member
Location
Malaga, Spain
Can someone explain exactly what this measurement is? (As far as I understand, it defines the reach, and is the most important measurement to determine the frame size you need.)

I'm guessing it's a horizontal line from the head tube to the seat tube if you imagine the seat tube extending to the same height as the head tube. Is this correct? And if it is, do you measure from centre to centre or closest edge to closest edge?
 

youngoldbloke

The older I get, the faster I used to be ...
geometry_fixedgear.jpg

Correct! Centre to centre - dimension C
 
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