In the first installment of GRAVELBIKE’s absoluteBLACK (aB) review, I covered aB’s 28T oval MTB chainring. Since then, the company began shipping their new oval CX chainrings. Available in conventional and direct-mount versions, absoluteBLACK’s CX rings feature the company’s Patent Pending narrow-wide tooth design. Because the conventional 5-bolt CX ring isn’t compatible with SRAM cranksets that have a hidden 5th bolt, I opted to test the direct-mount version. Over the past few weeks, I’ve logged 300-350 miles with the company’s 40T oval CX chainring on my Salsa Vaya gravel/commuter rig.
Despite a recent resurgence in popularity, oval chainrings are not new technology. Dating as far back as 1890, non-round chainrings have made numerous appearances in the marketplace, with the most in/famous being Shimano’s Biopace. More recently, oval rings enjoyed a boost in popularity when professional road racers Chris Froome and Sir Bradley Wiggins used non-round rings in their quests for Tour de France victories. And now, oval chainrings such as those offered by absoluteBLACK are seeing more use among off-road riders.
In the race for drivetrain domination, more = better. More cogs, more standards, more complexity. Bucking those trends, however, is microSHIFT’s ADVENT X group. Opting for only ten gears, ADVENT X takes on the competition not with more cogs, but with lighter weight, improved simplicity, and one very unexpected quality–availability.