bikemaniack wrote:The frame is only few grams heavier than the frame from "World lightest bike" project.
but clearly has at least 4cm more head tube and seat tube to fit Gum.
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bikemaniack wrote:The frame is only few grams heavier than the frame from "World lightest bike" project.
nicrump wrote:The main thing that is different about this frame than what I have done with ULs in the past is the main tubes. They are Isogrid of which you can google for more details but essentially the ID has a +/- grid of bundled tow which do the bulk of the work. The grid enables a much much thinner tube wall. The tube walls are 57% thinner than the thinnest tube wall i have ever used in the past. While you do rob peter to pay paul, paul gets a tad less and the excess loss is enjoyed in overall weigh reduction. While a 57% reduction in wall sounds fragile, it sorta is but not really. The grid is tight and very stable. If one damages the tube wall say to an focused impact, the grid will likely survive and prevent crack propagation. The main purpose of the wall(or skin) is to transfer load form grid to grid. These are the lightest tubes the Isogrid guys have made to date.
As far as I know, we are teh first to do tube-to-tube building with this stuff. You usually see it in Ti lugged frames form teh likes of Holland, Santana and the old Titus. Here is a pic of the inside surface of an Isogrid tube.
Fuchspk wrote:Like I said, I understand why you have them like this.
And they are not bad.
But I think it would be better to switch them around 90 degrees
Keep them quite short in the front and an long angel at the back and the fibers in 45degree.
I am on my phone right now but can make a sketch next time on the computer to show how it if you want.
And please,do not take it the wrong way, I do not mean to put that frame "down"
It is just something I was thinking about
nicrump wrote:
fallen86 wrote:with all the razor-blade work you do on your components i would have guessed you'd go with a nude carbon finish instead of a matte black... 30 grams in paint? blasphemy!
artray wrote:Hi Nick. Is it possible to replace a top tube or down tube on a bike that is already light and make it lighter using the isogrid ? My bike frame weighs around 770/780 grms. Say I replaced two of my main tubes would i get a significant weight loss. I know it depends on the weight of my tubes but im sure you could make a decent guess .
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