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Il n'y a pas de règles ni de formules. Un type qui fait la même taille et le même entrejambe que toi peut avoir besoin d'un cintre 10cm plus haut que toi car il n'a pas la même souplesse vertébrale / musculature / longueur de bras ....Et là encore, il faut savoir si l'on parle cintre, freins (quand ailes plongeantes) ou sommet repose-bras.lolo a écrit :bonjour à tous
peut etre la question est con
mais j aimerai savoir quelle est la difference de hauteur entre la selle et le guidon
exemple 10 cm, 15cm ,etc ...
2/ question comment determine ton ce delta
merci par avance
et que tu te fais lyncher sur le forum aprés 
Alors, pour info, ma hauteur de selle est de 69,5 cm et ma différence repose coude selle est de 16 cm.C = .005D2 -.2D
In this equation, 'C' = armrest drop, and 'D' = saddle height. Remember, saddle height in this case is measured from the bottom bracket to the top of the saddle, midpoint between its fore and aft.
This formula is good at 77.5 degrees of seat angle, where seat angle is measured from the BB to the center of the saddle's rails.
Should the seat angle be steeper or shallower than 77 degrees, one adds or subtracts .0075 from the integer '2' for each degree distant from 77 degrees. One subtracts for angles steeper than 77 degrees, and one adds for shallower angles. So, let us say we're talking about a person riding at 79 degrees of seat angle. In this case, the integer '2' has subtracted from it .0075 twice, resulting in .185. So the formula at 79 degrees of seat angle would read as follows:
C = .005D2 -.185D
At 76 degrees of seat angle, the formula reads as follows:
C = .005D2 -.2075D
This does not give you your proper armrest drop. This formula simply provides you a glimpse into the sort of bike set ups that tend to be used by the better pros over the years. Not all pros have armrest drop numbers that fit this formula. But perhaps 75% of them will have an armrest drop that falls within +/- 1.5cm. The formula changes, then, to express this range:
C = .005D2 -.2D +/- 1.5
But how applicable is this formula to the typical age-grouper, assuming we're talking about one who is a candidate for an optimized tri position? Subtract about 1.5cm. This yields the following formula:
C = .005D2 -.2D - 1.5 +/- 1.5
c joel: .005*69.5*69.5-[0.2-4*.0075]*69.5=12.33 +/-1.5 .....pinaise,t'es super souple ou je me suis gouré???Joel a écrit :Pour ceux qui comprennent l'anglais (pas le temps de traduire) et qui aiment bien se prendre la tête
Antoine ?
Alors, pour info, ma hauteur de selle est de 69,5 cm et ma différence repose coude selle est de 16 cm.C = .005D2 -.2D
In this equation, 'C' = armrest drop, and 'D' = saddle height. Remember, saddle height in this case is measured from the bottom bracket to the top of the saddle, midpoint between its fore and aft.
This formula is good at 77.5 degrees of seat angle, where seat angle is measured from the BB to the center of the saddle's rails.
Should the seat angle be steeper or shallower than 77 degrees, one adds or subtracts .0075 from the integer '2' for each degree distant from 77 degrees. One subtracts for angles steeper than 77 degrees, and one adds for shallower angles. So, let us say we're talking about a person riding at 79 degrees of seat angle. In this case, the integer '2' has subtracted from it .0075 twice, resulting in .185. So the formula at 79 degrees of seat angle would read as follows:
C = .005D2 -.185D
At 76 degrees of seat angle, the formula reads as follows:
C = .005D2 -.2075D
This does not give you your proper armrest drop. This formula simply provides you a glimpse into the sort of bike set ups that tend to be used by the better pros over the years. Not all pros have armrest drop numbers that fit this formula. But perhaps 75% of them will have an armrest drop that falls within +/- 1.5cm. The formula changes, then, to express this range:
C = .005D2 -.2D +/- 1.5
But how applicable is this formula to the typical age-grouper, assuming we're talking about one who is a candidate for an optimized tri position? Subtract about 1.5cm. This yields the following formula:
C = .005D2 -.2D - 1.5 +/- 1.5
Je suis bon ou pas
?a mon avis tu t'es gouré sur ta mesure d'EJ...zorglob a écrit :Bonsoir,
Je n'ai pas la réponse à la question de lolo et j'ai en plus une question (en fait des questions) encore plus c**.
J'aimerai acquérir un vélo de CLM et je penche pour le moment pour celui ci http://www.canyon.com/_fr/triathlon/pro ... =26#profil qui correspond à mon budget.
Le problème avec Internet est qu'on ne peut pas essayer avant de commander et j'hésite entre deux tailles. Le 53 ou 56. J'ai un vélo de route en 56 qui me satisfait et la question est de savoir si pour un vélo de CLM on doit prendre plus petit.
Je mesure 1.78m pour 80, 81 cm d'entrejambe donc en théorie il me faudrait un 54 ?
Questions subsidiaires:
- des avis sur les vélos de Canyon?
- l'entrejambe doit-il se mesurer à poil ou en tenue de cycliste
Bonne soirée.
