All in Chainrings

Ovum or OVAL

Rocking along after 750km with the new Absolute Black Oval Chainring and the Absolute Black Oval Guide chain guide. And I am sold! Having experienced the awful original Shimano Deore XT Biopace I had back on my first mountain bike in 1990; a Marin Eldridge Grade nonetheless,  I was intrigued by the claimed advantages of a 'modern' oval chainring.