Chain or belt tension is enable by an eccentric EBB.
Porthos eccentric EBB’s diameter is 54mm standard type.
It is made in Aluminium and weigh only 140gr.
Made in USA by Dennis Bushnell.
BB locking position is set by two hollow Stainless bolts that opens the “wings” and ensure perfect grip.
The Eccentric EBB accept 68mm and 73mm BB width.
No slippage, no squeaky noise.
Just the best.