Oval Direct Mount Chainrings for SRAM 8-Bolt Gravel / Road Cranks
OVAL-SDM8-40
Pairs well with
Oval Direct Mount Chainrings for SRAM 8-Bolt Gravel / Road Cranks
Machined in Minnesota
All Wolf Tooth chainrings come from the CNC machines here at Wolf Tooth HQ in Minnesota, USA. Machining chainrings in-house means we can control the entire production life cycle, from design, to prototypes, to machining, to fulfillment, all while maintaining meticulous quality control every step along the way.
Patented Wide/Narrow Tooth Profiles
Maximum chainring performance begins with chain alignment. Our patented Drop-Stop wide/narrow tooth profile ensures that the chain is centered on the chainring. This means best-in-class chain retention, extended life of the chainring, increased mud-shedding, and improved drivetrain efficiency.
Optimized For Your Chain
One Size Fits All means a compromise for all. Universal chainrings just don’t work when there are two fundamentally different chain designs. This is why we have two Drop-Stop chainring tooth profiles that are optimized for specific chain applications. Wolf Tooth chainrings provide maximum performance without compromise.
PowerTrac Elliptical
A major benefit of oval is how the shape of the chainring alters your gearing in two important phases of your pedal stroke by harnessing your body’s natural biomechanics. Here’s how it works. The area of the chainring with the larger diameter engages with the chain at the optimal point on the downstroke, we call this the Power Zone. If you were to look at a clock, the Power Zone sits between 1-5 and 7-11. Conversely, the Recovery Zone sits between 11-1 and 5-7 – is the weakest part of the pedal stroke, when the oval maximizes your efficiency. A 34T oval chainring behaves like a 36T chainring when you want power, and a 32T chainring when you’re climbing.
This all adds up to a smoother, more efficient pedal stroke with even torque for better traction at the rear wheel. With a Wolf Tooth oval chainring, you can harness more of your strength in the Power Zone, while having easier pedaling in the Recovery Zone.
Wolf Tooth Oval Direct Mount Chainrings for SRAM 8-bolt Cranks replace your existing spider and chainring with one clean looking, lightweight, and stiff piece of machined billet. They feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Drop-Stop B is optimized for SRAM Eagle and Flattop chains.
Compatibility
- These direct mount chainrings will replace your existing chainring and spider or replace the direct mount chainring for SRAM AXS cranksets, 2025 Cane Creek eeWings Titanium Cranks (8-bolt), and other cranks that use the 8-bolt mounting standard.
- SRAM Direct Mount DUB road cranksets use the 8-bolt mounting standard. Any of those cranksets with a removable spider also use the 8-bolt mount.
- Compatible with SRAM 12-speed and 13-speed groupsets including SRAM Red XPLR AXS.
- Wolf Tooth’s patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud-shedding ability.
- Chainline is 45mm on standard spindle cranks and 47.5mm on wide spindle cranks
Recommendations
- Recommend the use of a clutch-style rear derailleur for the best chain security
- For Installation, use the included custom T20 bolts. Torque to 4Nm with a T20 bit.
Related Products
Round Chainrings for SRAM 8-Bolt
Replacement Bolts for SRAM 8-Bolt Direct Mount chainrings and spiders
Tech Specs
Weight: 38T • 81g | 40T • 87g | 42T • 97g | 44T • 117g
Material: 7075-T6 aluminum
Made in the USA
Wolf Tooth is committed to provide the most precision components possible and has three different tooth profiles for optimal performance based on your chain type.
| Tooth Profile | |||
|---|---|---|---|
Tooth Profile |
Drop-Stop® B |
Drop-Stop® A |
Drop-Stop® ST |
| Chain Compatibility | |||
Chain Compatibility |
All 9s, 10s, and 11s Chains 12s Chains:
Not compatible with 12s Shimano HG+, 12s KMC, or 13s Campagnolo chains |
All 9s, 10s, and 11s Chains 12s Chains:
You can use Drop-Stop B when Drop-Stop A is not available* Not compatible with 12s SRAM Transmission (T-Type) and Road Flattop, 12s Shimano HG+, 12s KMC, 12s Campagnolo, or 13s Campagnolo chains |
12s Chains:
Not compatible with all other chains |
| Details | |||
Details |
 Tooth shape is nearly identical to Drop-Stop A, but has narrower teeth. Valley between teeth is deeper to accommodate larger rollers on Flattop chain. Outside faces of narrow and wide teeth touch chain to guide alignment. Drop-Stop B Chainrings |
 The original Drop-Stop tooth profile. The wide teeth are wider than Drop-Stop B. Outside faces of narrow and wide teeth guide chain alignment. Drop-Stop A Chainrings |
 Narrower teeth than Drop-Stop A. Wide teeth use Symmetric Trapezoidal (ST) profile to match extended inner edge on chain to create alignment (outside faces of wide teeth do not touch). Interaction of narrow teeth and chain are similar to Drop-Stop A and B. Drop-Stop ST Chainrings |
*We are in the process of migrating most Drop-Stop A to Drop-Stop B to make them compatible with SRAM Road and Transmission (T-type) Flattop chains.
WARNING Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to www.P65Warnings.ca.gov.