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More power and more traction: the Elliptical Direct Mount SRAM chainrings by Wolf Tooth Components
More power? Check! More traction? Of course! Fewer shift? Yup! Uneven pedal stroke? Not with the PowerTrac Elliptical™ (PTE) chainrings by Wolf Tooth! Their very own design is characterised by slightly less ovality (10%) and slightly less aggressive timing (112°) compared to other oval chainrings. That's why pedalling feels unchanged for most users and yet they still benefit from the performance and traction advantages that oval chainrings provide.
Application: Cross Country, All Mountain
Mount: SRAM Direct Mount
Teeth: 28 t, 30 t, 32 t, 34 t
Gearing: 1x9-speed, 1x10-speed, 1x11-speed, 1x12-speed
Type: 10 % oval
Offset: 3 mm (Boost)
Chainline: 52 mm
Material: aluminium (7075-T6)
- SRAM direct mount cranks
- all 9-speed, 10-speed and 11-speed chains
- SRAM Eagle and KMC 12-speed chains
- not for SRAM Flattop 12-speed, Shimano 12-speed
- 10-speed chain recommended for 9-speed drivetrains
- Wolf Tooth PowerTrac Elliptical and Wide-Narrow design
- increased and more even pedalling performance, more efficiency in the recovery zone and more traction thanks to constant torque
- timing: 112° to TDC (Top Dead Center)
- Boost chainline (3 mm offset), 148 mm over locknut dimension
- Made in the USA
Note from the manufacturer: Please reuse the 3 original spider bolts to directly mount the chainring or buy Wolf Tooth spare bolts (installing/removing is best done with T25 L-key). Damped rear derailleur recommended.
PowerTrac Elliptical™ (PTE)
Wolf Tooth's PowerTrac Elliptical chainrings feature 10% ovality, in combination with 112° timing, which is measured according to the Top Dead Center (TDC). This means that the chainring section with a wider diameter engages the chain at the optimum point in the downward stroke, known as the power zone. In this way the natural biomechanics of the body are taken into account.
PTE is like having two chain rings in one. This is because your pedal stroke is biomechanically weakest when your pedals are at the upper and lower positions of the circle (at 11 to 1 o'clock and 5 to 7 o'clock on a dial), also known as the " recovery zone" . Thanks to the oval shape of the chainrings, the narrower section grips at this stage, which makes it seem as if you have two chainring teeth less. It's as if you were instantly shifting to a smaller chainring, for example from 34 to 32 tooth.
The reverse is true for the power zone of your pedal stroke - when your front pedal is at 1 to 5 o'clock. Here, when your legs are at their strongest and most efficient, the PowerTrac elliptical has a wide diameter and works as if you have two extra chainring teeth, about 36 instead of 34.
The whole thing also benefits traction. The torque on the rear wheel is more even, so the probability of you overpowering and slipping in the power zone is reduced. It also makes pedalling easier in the recovery zone and maintains momentum. This " 2 chainrings-in-1" effect keeps the pedal stroke smooth and the torque constant at every stroke.
Wolf Tooth has invested countless hours in the design, prototyping and testing of their Wide-Narrow chainrings and has developed a highly innovative tooth profile. Test riders around the world have confirmed that this design brings unparalleled performance.
The right side of the chainring tooth has a different shape than the left side. The right side transmits the power to the chain and the left side opens a free space for cleaning mud and dirt. Since the two sides have completely different functions, it makes sense to design them differently, true to the motto: extra reinforcement where you need it, less material where you don't.
The right side of the Drop-Stop tooth is as wide as possible to distribute the load over a larger area, which also minimises wear. The left side of the Drop-Stop tooth helps to guide the chain, but it does not transmit any load. Therefore the left side is narrower than the chain roller. Wear is not an issue on this side, so Wolf Tooth was able to save material and create a better mud clearance channel. More free space means less friction and less change of the chain being dropped due to mud.
Manufacturer Part Numbers:
28 tooth: OVALSDM28BST
30 tooth: OVALSDM30BST
32 tooth: OVALSDM32BST
34 tooth: OVALSDM34BST
- 1 x Wolf Tooth Components Elliptical Direct Mount SRAM Boost chainring
- black/28 tooth: 60 g
- black/30 tooth: 68 g
- black/32 tooth: 74 g
- black/34 tooth: 83 g