> ​In the range of common bicycle tubing, the rule of thumb is one step in 
> diameter changes deflection about the same as two steps in thickness. So, a 
> 25.4 (non-OS) top tube in 9-6-9 will flex about the same as a 28.6 (OS) top 
> tube in 7-4-7. The OS tube will be a little lighter, but the non-OS tube 
> will be tougher (if the steels are similar). Of course, then there's number 
> of top tubes to consider!
>
> Best,
> joe broach
> portland, or
>
>  
>

Thanks for posting this fascinating tid-bit of information.  Frame design 
has become a particular interest of mine and I enjoy learning things like 
this.  

 

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