Q&A
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Parent Category: Q&A
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Category: Q&A Technique
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Published on Friday, 22 January 2010 07:22
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Written by Luca Salvatelli
Dear Editor,
have performed the biomechanical measure which results in a traditional frame with the following measures:
cm seat tube. 52.9 - cm top tube. 53.4 - cm.14.2 head tube at an angle of 74.34 between the two tube. Buying a new bike and in particular a Colnago EPS sloping, I have doubts about measure. I saw that two measures are among the 48s and 50s; my cyclist recommend 50s, that I consider a little big. Congratulations for your web site.
Dear Reader, thanks for the compliments. The appropriate measure of your frame would be the traditional size 52, that would "brush". It has the top tube 53 millimeters long, and therefore very close to its 53.4 mm, and the vertical tube of 52 centimeters, in less than 9 millimeters of the ideal and only the head tube is actually shorter than the ideal for her: 125 vs 142 mm. Even the angle of the tube and very close to his ideal. Considering the cost of the frame, then it would be preferable to order the traditional model in size 52. In this case, an stem must be found suitable to compensate for the shorter length of the head tube, or adopt a range of thicknesses. If he wants to take power version sloping, then it's probably better to take the measure 50s, because the horizontal tube is longer than just 4 millimeters from the ideal, the head tube is longer than one millimeter, while the vertical tube 8 millimeters is longer than the one necessary. The biggest problem is that it is the seat tube is too tilted toward the rear. This is something not to be underestimated because they end up with having to move the saddle for a very correct alignment knee-pedal. It's something that should be seen in reality, not a graphic representation of the computer .... For this reason, the size 50s might be, despite everything great. Unable to make a real and safe measurement and you should take the 48s, which will have to adapt length and height of the stem to re-establish the correct measures (the top tube is shorter than 6 mm, tube shorter than 9 mm head tube and shorter than 17 millimeters). The seat tube angle is 74.58 degrees, might be the opposite problem to what was said for the frame size 50s, and may need to rewind the seat, however the difference is less than the model 50s. Just to give you a comparison would choose a professional athlete, being able, the model 48s, because smaller and lighter. My advice is to take the traditional 52, is his "frame"; in the alternative 48s.
