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Guru?
Originally Posted by bruce19
(Post 21120969)
https://cimg7.ibsrv.net/gimg/bikefor...026dcd6186.jpg
It's been a long time since I had a TI bike and it was a LeMond triple crank. The past 4 yrs my go to bike has been this Guru Sidero (steel) w/SRAM Red and Mavic Ksyrium Elite USTs. It weighs 17 lb 11 oz with just Speedplay Zeros. I love this bike. |
Originally Posted by marcoguzm
(Post 21121863)
The Guru Sidero looks nice. What kind of tubes does it have?
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They make sky scrapers out of steel, because it is flexible. Steel will stretch. Make a spring out of ti, post again when you are finished.
When you know.:deadhorse2: |
Good
Originally Posted by bruce19
(Post 21122067)
Columbus Spirit.
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Originally Posted by captaincowpants
(Post 21122116)
They make sky scrapers out of steel, because it is flexible. Steel will stretch.
Flexibility can be defined by Young's Modulus (Modulus of Elasticity), or how much a material will stretch in response to stress: Steel, Structural ASTM-A36: 200 GPa Titanium Alloy: 105-120 GPa Titanium is at least 66% more flexible than steel.
Originally Posted by captaincowpants
(Post 21122116)
Make a spring out of ti, post again when you are finished.
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Originally Posted by terrymorse
(Post 21122221)
Did that already, decades ago. Ti springs are fairly common on spacecraft, where weight and reliability is at a premium. Back when my job was space hardware, I had to analyze a Ti spring design for an oscillating mirror. The flexibility of Ti was useful, it meant that the spring didn't have to be stupid thin (and thus more delicate and harder to machine).
You can also buy titanium springs for mountain bike shocks. http://www.rentoncoilspring.com/whyti.html These guys have ti springs for formula 1 cars and snowmobile clutches. |
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