Gravel bikes

[mecheng89]

On 4/23/2024 at 7:43 AM, 100Tours said:

Yes, in theory. Aluminium has a finite number of fatigue cycles until it will break (unlike steel or carbon). I'm still riding a 20-year old aluminium cannondale however, and it hasn't shown signs of damage yet. Might happen during my lifetime, might not. I've seen fractured Titanium frames that are only a few years old, but not Aluminium.

Alu was the material of choice for h/bars, pedals, and so on for Paris Roubaix up until a few years ago because it is more forgiving than carbon (carbon will kill road buzz, but not corrugations), and it likely represents a lot better value as a gravel bike material at the moment. If you have 50k+ to spend then go Carbon, if you're in the 10-20k ballpark then Aluminium is a really good choice.

 

Everything has a finite number of fatigue cycles! 

[100Tours]

12 hours ago, mecheng89 said:

Everything has a finite number of fatigue cycles! 

I'm not a mech eng, but there's this..

Fatigue life N_f is the number of stress cycles of a specified character that a structure sustains before failure occurs. For steel, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles. This value is called a fatigue limit or endurance limit.