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Titanium or Steel

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Titanium or Steel

Old 09-13-19, 08:19 PM
  #151  
marcoguzm
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Guru?

Originally Posted by bruce19 View Post

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.
The Guru Sidero looks nice. What kind of tubes does it have?
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Old 09-14-19, 06:12 AM
  #152  
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Originally Posted by marcoguzm View Post
The Guru Sidero looks nice. What kind of tubes does it have?
Columbus Spirit.
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Old 09-14-19, 07:15 AM
  #153  
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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.
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Old 09-14-19, 08:41 AM
  #154  
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Good

Originally Posted by bruce19 View Post
Columbus Spirit.
Nice tubing, steel is still alive, and titanium is coming back
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Old 09-14-19, 09:30 AM
  #155  
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Originally Posted by captaincowpants View Post
They make sky scrapers out of steel, because it is flexible. Steel will stretch.
Implying that steel is flexible, but titanium is not? That is not true.

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 View Post
Make a spring out of ti, post again when you are finished.
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).
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Old 09-15-19, 07:43 AM
  #156  
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Originally Posted by terrymorse View Post
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.

Last edited by big john; 09-15-19 at 07:55 AM.
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Old 09-15-19, 07:52 AM
  #157  
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Since you asked.

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