Originally Posted by Eatadonut
Where's the weak point? I can't believe the chain pushes that hard. I could do the math if someone could provide me a ballpark of the coef. of friction between a 23mm rubber tire and smooth concrete.
The radius of the wheel, cog, and crank-arm all "magnify" the force of the tire skidding on the rode, or even worse, the tire about to skid. Also, the length of the chain between chainring also acts as a hug moment arm trying to push the tensioner down.