Wolf Tooth Components Elliptical Direct Mount Boost Race Face Chainring for HG+ 12-speed

Wolf Tooth Components Race Face chainring with oval design for Shimano HG+ 12-speed chains

The Wolf Tooth Components Elliptical Direct Mount Boost chainring Race Face for Shimano HG+ 12-speed chain has an oval design, which accommodates the biomechanics of pedalling and also increases traction. It is compatible with all Race Face Cinch crank systems and has been specially adapted to Shimano XTR, XT and SLX 12-speed Hyperglide+ chains. These interact with the chainring in a very different way than a traditional wide narrow design. Wolf Tooth has therefore invested a lot of time to understand how the HG+ system works and to design an optimal tooth profile. The result is a chainring that combines the quiet and smooth performance of the Hyperglide Plus drivetrain with the legendary Wolf Tooth chain retention. This also counteracts premature wear, which can occur when using a non-optimised product. As Boost version the chainring is intended for 52 mm chainline and has 3 mm offset.

Specifications:

Application:

Cross Country, All Mountain, Enduro

Mount:

Cinch Direct Mount

Teeth:

30 T, 32 T, 34 T

Gearing:

1x12-speed

Type:

oval 10%

Technical Information:

Offset:

3 mm (Boost)

Chainline:

52 mm

Material:

aluminium (7075-T6)

Compatibility:

• all Race Face Cinch cranks
• Shimano 12-speed HG + (Hyperglide+) chains

Features:

• optimised tooth profile for HG+ 12-speed chains, PowerTrac Elliptical design
• excellent chain retention
• 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)
• 52 mm chainline for Shimano 12-speed drivetrains suitable for both 148 mm and 142 mm over locknut dimensions
• Made in the USA

Note from the manufacturer:

For very muddy conditions a chain guide in combination with clutch rear derailleur is recommended.

Technology:

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 wider diameter chainring section engages the chain at the optimum point in the downward movement, 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.

Drop-Stop® ST
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 off 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.
In the ST version, the Drop-Stop tread is optimised for use on mountain bikes with Shimano Hyperglide+ 12-speed gears. The teeth are somewhat narrower overall. The wide teeth have a symmetrical trapezoidal shape (Symmetric Trapezoidal = ST) to accommodate the more extended inner edges of HG+ chains and thus guide them. The outsides do not touch the chain, unlike the narrow teeth and unlike Drop-Stop A and B.

Manufacturer Numbers:

30 tooth:

OVALRFC30BSTSH12

32 tooth:

OVALRFC32BSTSH12

34 tooth:

OVALRFC34BSTSH12

Contents:

• 1 x Wolf Tooth Components Elliptical Race Face Shimano HG+ 12-speed chainring