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<blockquote data-quote="Dazza" data-source="post: 2904863" data-attributes="member: 33758"><p>The performance differences are small</p><p>but some times the sloping top tube is a better fit to the position of the rider.</p><p></p><p>The sloping top tube has minor structural merit</p><p>with the two smaller triangles of frame tubes</p><p>which is a tiny bit lighter and little more rigid.</p><p>I use approx 6 degrees of slope to the top tube</p><p>This drops the seat tube approx 60mm</p><p>Shortens the top tube by 15mm</p><p>and the seat stays by approx 45mm</p><p>The seat post must be longer and have enough rigidity so to not behave like a fishing pole.</p><p>All this saves appox 40 -50 grams. That is all!</p><p>(Green bike picture, it is my current weekend bike)</p><p>One advantage of a sloping top tube is get the head tube higher for less athletic riders. (Blue Randonneur Picture)</p><p>and for very small frames (pink bike) you can have more seat post showing and top tube clearance</p><p></p><p></p><p>The horizontal (level) top tube works just fine in most designs and looks nice.</p><p>For many it is what they have always known.</p><p>That is cool.</p><p>My next bike for myself is going to be a<em><strong> Cadenzia</strong></em> frame with Dario's new carbon fork to test. This frame will have a level top tube will will be stiff for my size and weight due to the XL tube size. It will be an interesting experiment and I may also use the new XL XCr tubes for lugs for extra fun.</p><p>(refer to attached CAD drawing)</p><p>Over the last 15 years I have made myself only one new bike that I ride! (The Green one)</p></blockquote><p></p>
[QUOTE="Dazza, post: 2904863, member: 33758"] The performance differences are small but some times the sloping top tube is a better fit to the position of the rider. The sloping top tube has minor structural merit with the two smaller triangles of frame tubes which is a tiny bit lighter and little more rigid. I use approx 6 degrees of slope to the top tube This drops the seat tube approx 60mm Shortens the top tube by 15mm and the seat stays by approx 45mm The seat post must be longer and have enough rigidity so to not behave like a fishing pole. All this saves appox 40 -50 grams. That is all! (Green bike picture, it is my current weekend bike) One advantage of a sloping top tube is get the head tube higher for less athletic riders. (Blue Randonneur Picture) and for very small frames (pink bike) you can have more seat post showing and top tube clearance The horizontal (level) top tube works just fine in most designs and looks nice. For many it is what they have always known. That is cool. My next bike for myself is going to be a[I][B] Cadenzia[/B][/I] frame with Dario's new carbon fork to test. This frame will have a level top tube will will be stiff for my size and weight due to the XL tube size. It will be an interesting experiment and I may also use the new XL XCr tubes for lugs for extra fun. (refer to attached CAD drawing) Over the last 15 years I have made myself only one new bike that I ride! (The Green one) [/QUOTE]
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