The Wolf Tooth Elliptical Direct Mount Chainring for SRAM with Shimano 12 Speed Hyperglide is designed to work with SRAM direct mount cranksets with 3-bolt, with a tooth profile that's perfect for a Shimano 12 speed Hyperglide+ chain. This interacts with a chainring differently to most chains, which is why the engineers at Wolf Tooth went back to the drawing board to create the Drop-Stop ST profile.
This has narrower teeth than the Drop-Stop A wide-narrow profile. Although the narrow teeth work similarly with the chain to those on other Drop-Stop chainrings, the wide teeth use the Symmetric Trapezoidal profile that gives the ring its name. The outside faces of these teeth don't touch the outer plate of the chain, while the extended inner edge matches that of its partner chain.
Using this profile ensures that the Elliptical Direct Mount Chainring for SRAM offers smooth, quiet performance in conjunction with the HG+ drivetrain, along with the usual Wolf Tooth benefits of long life for chain and chainring alike, low friction and outstanding chain retention.
It also uses PowerTrac EllipticalTM technology that ensures the larger diameter section engages the chain at the most powerful point of your downstroke, while the smaller diameter section does the same at the weakest point of the pedal stoke, maximising its efficiency. For that reason, a PowerTrac EllipticalTM ring matches the power of the next biggest circular ring on both parts of the stroke.
Plus, since Wolf Tooth's PTE rings are 10% less ovalised than equivalent chainrings from other brands, with less aggressive timing, your pedal stroke will feel as smooth as with a round chain ring. This ensures even power transfer, leading to improved traction on technical climbs.