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Absolute Black > Gravel & CX chainrings > Oval narrow-wide > Absolute Black Oval CX DM Easton EC90SL
Absolute Black
 

Absolute Black Oval CX DM Easton EC90SL

Item#PriceStock
38T Black
#: EAOV38BK
Price: $118.99
Stock: In stock
EAOV38BK$118.99In stock
40T Black
#: EAOV40BK
Price: $118.99
Stock: In stock
EAOV40BK$118.99In stock
42T Black
#: EAOV42BK
Price: $118.99
Stock: In stock
EAOV42BK$118.99In stock
44T Black
#: EAOV44BK
Price: $126.99
Stock: Restock Aug 21, 2020
EAOV44BK$126.99Restock Aug 21, 2020
46T Black
#: EAOV46BK
Price: $126.99
Stock: In stock
EAOV46BK$126.99In stock
48T Black
#: EAOV48BK
Price: $132.99
Stock: In stock
EAOV48BK$132.99In stock
38T Red
#: EAOV38RD
Price: $118.99
Stock: In stock
EAOV38RD$118.99In stock
40T Red
#: EAOV40RD
Price: $118.99
Stock: In stock
EAOV40RD$118.99In stock
42T Red
#: EAOV42RD
Price: $118.99
Stock: In stock
EAOV42RD$118.99In stock
44T Red
#: EAOV44RD
Price: $126.99
Stock: In stock
EAOV44RD$126.99In stock
46T Red
#: EAOV46RD
Price: $126.99
Stock: In stock
EAOV46RD$126.99In stock
48T Red
#: EAOV48RD
Price: $132.99
Stock: In stock
EAOV48RD$132.99In stock


Overview
 
Our premium 1X Easton compatible, Direct mount Oval chainring is designed for Easton EC90SL cranks specifically. Super stiff, mud optimized narrow-wide chainring is a Perfect choice for Cyclocross and Gravel setup. Eagle 12spd compatible.

Advantages of our special Direct mount chainrings:
  • Finest design to provide excellent weight to strength ratio
  • One of a kind special oval shape (Patent Pending)
  • 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 
  • Designed to handle mud and grass with easy
  • 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 The World's finest oval (elliptical) road chainring. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings.
The most advanced, Patent Pending narrow/wide tooth profile currently produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.
Not convinced yet? Read what other customers write.
Specs
  • Size (Mass +/-1g): 38T (94g), 40T (101g), 42T (108g), 44T (109g), 46T (120g), 48T (122g)
  • Color: Black, Racing Red
  • Compatibility: Easton Cinch(tm) EC90SL cranks and RaceFace Cinch cranks. Eagle 12spd compatible.
  • Material: cnc machined 7075 Txxx Aluminum. Long-lasting construction
  • Finish: type II anodizing
  • Ovality: Optimized to each size separately. Range: 10.2-12.1% and Timing of 110.5-112.3° after TDC (top dead center) Patent Pending

All Absolute Black products are designed in UK and manufactured in Poland (EU) to the highest standards of quality.
 
Why Oval
 
Why our oval chainrings work
Our Oval chainrings work because a rider does not produce power evenly through a pedal stroke; they maximize the part of the stroke where power is produced and minimize resistance where it isn't. Oval rings make the spin cycle a lot smoother and are easier on legs while climbing. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. You will actually feel your stroke to be more "round" with an Oval shape than with a round chainring.

Why it matters
Traction, Traction and Traction. With oval rings rear tire traction improves greatly on loose and slippery terrain. Smoother power delivery to your rear wheel means that you will be able to maintain better, constant cadence; get less stress on the joints (knees) and therefore be able to keep certain level of effort for longer. This results in higher average speed. Moreover, 11 studies made by various Universities in the World show that using oval chainrings human legs utilize more muscle groups (compared to round one), but each of them to lesser degree. Load from pedaling an oval chainring is spread over greater muscle mass which in effect gives you the feeling of fresher and more relaxed legs. It is world's finest oval chainring backed by tens of thousands of customers.
 
Technology
 
Word on BIOPACE
Please understand that this is not Biopace technology. Shimano created Biopace with the completely wrong orientation of the biggest radius of the oval. Instead of positioning it in power zone which is slightly below the level of the crank, they clocked it to the dead zone where human generates least power. The result was that in power zone pedaling was too easy and in dead zone very difficult. Exactly opposite to how it should be.

Round rings do not optimize the way humans produce power

Other elliptical chainrings
Clocking (timing) and shape of the oval are the most crucial parts of the design. Ride quality of Absoluteblack Oval ring will be different to ovals from brand X or Y. 2 years of development of our ovals resulted in commercially most successful product of its kind. AbsoluteBlack is the First company who managed to successfully popularize ovals in mountainbike sport. Please note: Other manufacturers offer one timing and ovality setting for all chainring sizes, but pedaling behavior changes with each size considerably. To optimize for this, every chainring size needs to be a bit different. For example the smaller the chainring size the bigger the ovality has to be to help climb steeper hills more effectively. This is where we specialize in and optimize every size to particular pedaling style. This is also why we do not provide information about timing and exact ovality of the chainring as each one is different.

 

Shifting quality and technology
Both, inner and outer oval chainrings are optimized with smooth shifting in mind. This is why the back of the Absolute Black Oval road chainring does not feature cutouts, like other oval products on the market. Instead, we design smooth angled surfaces, to help chain to slide quickly and precisely between chainrings. Absolute Black outer oval chainrings have 6 up-shifting ramps, for easy and quick gear change, even under load. Each outer chainring also features 12 down-shifting points. Instead of steel shifting pins we use a CNC machined "ramp and recess" solution. Special raised ramps work in conjunction with the tooth recesses to stabilize the chain when shifting. Our oval chainrings DO NOT require any modification to the front dérailleur in order to work properly (apart from small standard adjustment)

How Absolute Black Oval Rings Shift
 
The importance of timing and shape with oval chainrings
The oval chainring movement across all cycling disciplines is growing rapidly, led by absoluteBLACK, the world leaders in this important product category.

However, not all oval chainrings share the same performance characteristics as absoluteBLACK. The 'clocking' (timing) and shape of the oval are the most crucial parts of any oval chainring design, absoluteBLACK spent three years in design development and have perfected both timing and shape design elements - ensuring the ride quality of absoluteBLACK oval ring will be different and superior to ovals from other brands (as many abosluteBLACK customers already realised).

Where most other brands retain the same timing (position of the crank arm relative to the oval) and shape of the oval across all their sizes - because it's cheaper and less time consuming. absoluteBLACK believe that each different size ring requires a bespoke, optimised, perfect pedalling solution. So that is what we do - for every chainring absoluteBLACK make. For example, the smaller the chainring size, the bigger the ovality has to be to help climb steeper hills more effectively. We keep our exact Patent Pending data a secret, to ensure we get the best possible absoluteBLACK advantage over other brands, and you get the best possible ride experience.
 
Instalation
 
How to mount AB Oval chainring to Easton Cinch crank:
CINCH is a system used by Easton and RaceFace to secure a chainring on the crank. Hence same way of mounting apply. AB chainring has a mark on the backside that you need to line up with the center of the crank arm to achieve the correct position. Once this is done use BB key to close the lockring (torque spec written on the lockring itself)
 
Absolute Black always recommends using a new chain when fitting new chainrings.
Chain options
10, 11 or 12spd chain for geared bike or 6-8 spd for SS. If used in 1x9 drivetrain - 10spd chain must be used to obtain the performance. (yes - 10spd chain will work great on 9spd cassette)

Chainguide needed?
No. But if you want one then chain guide should have 2 teeth more capacity than nominal oval ring size.
 
FAQ
 
What size should I choose?
Most CX riders choose 38T as most versatile option. For Gravel 44 or 46T is a good start. If you feel strong try bigger size.

* 38T Oval ring will suit best someone who uses 37 or 38T chainring currently. While pedaling, you will feel similar effort to the one riding round 37T ring, but you will gain the speed similar to riding 40T chainring.
* 40T Oval chainring has an ovality of 38/42T and is best for someone who uses currently 39 or 40T round ring.
* 42T Oval chainring has an ovality of 40/44T and is best for someone who uses currently 41 or 42T round ring.
* 44T Oval chainring has an ovality of 42/46T and is best for someone who uses currently 43 or 44T round ring.
* 46T Oval chainring has an ovality of 44/48T and is best for someone who uses currently 45 or 46T round ring.
* 48T Oval chainring has an ovality of 46/50T and is best for someone who uses currently 47 or 48T round ring.

Remember when selecting your chainring sizes - it's not about what others use, but about ensuring YOUR ability to maintain a comfortable and effective cadence across the terrain you ride most often. If you ride chainrings that are too large (round or oval), your cadence will be lower. This can affect your performance by prematurely tiring your legs and possibly lead to stress injury in your knee joints.

* Do I have a perfect pedal spin?
This is an important one. Professionals and semi pro cyclists spin perfect "circles". The rest of us often struggle with our pedalling action, simply because we don't spend every day of every week on the bike, to master this skill. Switching to oval rings effectively correct an imperfect pedalling action – delivering the smooth power delivery the pros developed through thousands of hours of training. One of the key reasons the benefits of oval chainrings have historically proven hard to prove in lab tests, is because they were nearly always done using Professional riders – as a user group they are the least likely to gain a performance increase from a switch to oval, as their pedalling is already close to perfection. Where ovals shine however is with rest of us, who ride for pleasure and not for a job. Simply 99% of road cyclists will benefit from having oval chainrings on their bikes.
 
 
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