OVAL guidering chainring for E*thirteen - E13

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Our premium E*thirteen (E13) compatible Direct mount Oval chainrings are designed for E*thirteen TRS cranks only. It is the most Premium oval chainring on the market with scientifically proven performance gains.

Ovals helped me with my osteoarthritis in both knees

" The oval rings continue to impress me and have made a genuine difference to my riding particularly as suffer from osteoarthritis in both knees. There does not seem to be as much stress on my knees and they don't ache when I have completed my rides. I am super impressed!"

Just a few hours and I’m used to them

" I had my AB chainring installed last week and after few hours of pedaling, boom, it hit me. This chainring made a big difference. My knees didn’t hurt, I felt faster on flats and uphill. "

Smooth ride and easy on the knees

" I’ll never go back to round. Super smooth, eased my knee pain, and has helped my climbs on technical ascents ten fold."

Better power delivery

" Initially, reluctant. However, after riding my 29er I was very impressed with the power distribution and no knee pain. AB undoubtable got it nailed. You won't even know your are riding an OVAL after 15 minutes time."

Great looks and even better climbing performance

" Super pleased with the overall look and performance of the chainring. I can 100% say that it does improve my pedaling while climbing and getting through rough uphill stuff. Each pedal stroke is now more fluid and cadence is better on those longer climbs."

Size (Mass +/-1g):	30T (58g), 32T (62g)
Color	Black
Compatibility	E*thirteen TRS, TRS+ and TRS Race Carbon cranks only. Not compatible with Shimano HG+ chain
Material	cnc machined 7075 Txxx Aluminum. Long-lasting construction
Finish	type II anodizing
Chainline	49mm
Ovality	Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3° after TDC (top dead center) Patent Pending

If you wish to check for frame clearance with new oval ring, below you can find measurement of biggest dimension of the oval (tip to tip of tooth):

30T: 134mm ; 32T: 143mm

Advantages of our special Direct mount chainrings:

*Finest design to provide excellent weight to strength ratio
* min 12% lighter over stock round chainring
*One of a kind special oval shape (Patent Pending)
*Greatly improves traction and climbing abilities
*Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months!
*Special 3D teeth machining for ultimate mud relief decrease wear and noise dramatically
*Superb quality and great look.
*You will ride faster using ovals. If you keep using round ring then others will get quicker.
*You will not "feel" the oval shape at all
*Reduces stress on knees
*We mastered our oval chainrings to perfection, so you can get best possible advantage from the oval/elliptical shape.

How to mount E*thirteen Oval chainring:

Full instruction with photos can be found here:

E*thirteen mounting instruction of a chainring

You will need E*Thirteen BB Install/Spider Removal Tool first. With this tool you need to simply open the lockring that holds the chainring on the crank. It's best to clamp that tool in a vice and Turn the crank counter-clockwise (looking from the top). Once the lockring is removed, take off old chainring and re-grease the splines on the crank. Place new oval chainring with convex side to the crank, but at the same time observing the small dimple (located next to spline interface) to be aligned with center of the crank arm. This is crucial to obtain correct chainring position. Now, place the lockring back. Since you will not be able to use torque tool, please do the following steps: Screw the lockring to the point where it starts to give you bigger resistance (as it touches the chainring now). From this point rotate the crank arm further by about 90 degrees. This will give you proper 30Nm locking force. Done

Oval (elliptical) chainring does not compromise the work of clutch mechanism in rear derailleur(video at the bottom). It also does not require chain tensioner when using in singlespeed application. These chainrings also help you to recover after knee injuries as pedaling becomes smoother and less exhausting. It is the most advanced oval chainring currently on the market.

Designed in UK. Manufactured in Poland (EU).