Our premium Sram compatible 1X Aerodynamic Direct mount Oval chainring is designed for Sram cranks like Force and Rival where spider can be replaced with direct mount chainring.

Fits both GXP and BB30 spindle cranks.

This is 1X narrow-wide chainring. Ideal for Triathlon, Criteriums and Time Trial. 

Size (Mass +/-1g):50T (197g), 52T & 54T- Coming soon

Color Black

Compatibility SRAM Force 22, Force 1, CX1, Rival 22, Rival 1, S900. GXP and BB30 models

Material cnc machined 7075 Txxx Aluminum.

Long-lasting construction

Finishtype II anodizingOvality10.45% and Timing of 108.3° after TDC (top dead center) Patent

PendingWho will benefit from 1X Aero chainring for Sram cranks


It is designed for anyone who is looking for additional gains in aerodynamics and increased performance. Will suit best to Triathlon, TimeTrial or Criterium bike where one chainring on the front can be used with great success. Chainring feature our unique narrow-wide teeth profile for chainguide free build.

Advantages of our special Aero Direct mount chainrings:

*Most aerodynamic chainring ever created that fits directly on the crank arm.
*Finest design to provide excellent weight to strength ratio and aerodynamics (Patent Pending grooved structure)
*One of a kind special oval shape that helps you climb faster (Patent Pending)
*Unique Patent Pending narrow-wide teeth profiles to keep your chain in place with no guide.
*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 and helps to maintain your legs fresher for longer 
*Reduces possibility of cramps
*Lastly, no need for using "aero" covers anymore.


Why our oval chainrings work

Our premium 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

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. This in turn let you achieve higher average speed riding uphill. Another benefit from spreading the load over more muscles is reduced risk of having a cramp while riding and much better overall feeling after the hard ride. 

Why our Oval chainrings do not have adjustable timing

Because we have discovered that small adjustments made from our Premium timing position is just splitting hairs. There is great advantage coming from round to oval. But adjusting oval itself from our premium position does not bring more measurable advantage. Non adjustable rings are also much lighter and very easy to mount, letting you not to worry about all the possibilities you could have with adjustable ring. 

Why our oval chainring is more aerodynamic than any other offering.

Firstly, direct mount full body chainring will always be more aerodynamic than 4 or 5 bolt spider options. Secondly, our unique grooved outer surface reduces drag even further. 
It is well known feature that the drag coefficient on a dimpled golf ball is much lower than that on smooth ball. Numerous studies showed that turbulence is generated through the instability of shear layer separating from the edge of dimples and delays flow separation which makes it more aerodynamic. Dimpled structure generate 220% less drag than a smooth surface. However recent studies made by golf industry leaders show that new grooved surface can be made with almost same drag reduction vs smooth surface. Why it matters? Because grooved surface is more practical to manufacture on various bike parts like chainrings. Grooved surface could greatly reduce drag generated by big smooth „aerodynamic” chainrings currently offered on the market. 
Few facts you should know: 
*It is well documented that grooved surface on the sphere generates less drag when rotating well below 150rpm. In fact it generates least amount of drag when not rotating at all! 
*It is well documented that grooved surface generates least amount of drag when traveling at speeds around 10-15m/s (36-54km/h) These parameters fit well to how we ride the bike. Hence grooved surface on various flat parts, like Absoluteblack Aero chainrings is the most preferable way of further drag reduction.


How to mount Aero Oval chainring to Sram crank:

First you need to remove crank from the bike. Once removed, unscrew these 3 torx t-25 bolts from the crank. Then remove the spider+chainring combo you currently have there. Clean the splines and put some grease on them. Position the chainring in place (note there is only one way to fit this Sram chainring so you don't have to worry how to do it). Close all 3 bolts to about 5-7Nm. 


Always use a new chain with a new chainring.


Designed in UK. Manufactured in Poland (EU).

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 causing knee pain and lumpy pedaling cadence. Exactly opposite to how it should be.


The World's finest oval (elliptical) road chainring. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings.


SRAM, GXP, and XX1 are trademarks of SRAM and are used for informational purposes only.

absoluteBLACK OVAL AERO SRAM dm 54 1X narrow - OVAL lánctányér

Size - Méret
  • Why our Oval chainrings do not have adjustable timing


    At Absolute Black we have extensively studied the relevant performance data regarding the optimum percentage of ovality, shape and, critically, the timing of the oval – the positioning of the high and low points of the oval, in relation to the position of the crank arm and focus this into one single mounting position – this is the really important part of what makes Absolute Black Oval chainrings so effective. By simplifying our oval chainring design, to reflect a single high performance ‘sweet-spot’, we are able to make the process of fitting Absolute Black oval chainrings faster and easier, as well as making our rings even lighter. 


    Can I use only small oval chainring and keep big one round? (and vice versa) Or should I use both oval rings?

    There is no problem using two different shaped chainrings mounted to one crank from mechanical and biomechanical point of view. However, please remember that oval chainrings are most effective in two situations; when you pedal uphill and if you don't have perfect pedalling action. We recommend using small oval ring as a starting point. Many professional riders switch to using an oval inner chainring for races with hard climbing – even when their equipment sponsors do not make an oval ring – knowing that it cannot be seen tucked behind their sponsors outer round chainring. When it comes to the style of outer chainring you need to answer two questions:


    * How often do I keep riding on big ring over smaller, less demanding climbs? 


    If the answer is "often" then fitting an Absolute Black outer chainring is advised to gain the maximum benefit. However, if the answer is "very rarely" then keeping your existing round outer ring is a way to save some money.


    * 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.


    How to mount 110/5 Oval chainring:


    First, you need to remove your crank from your bike. Once removed, unscrew the 5 bolts that hold two chainrings together with a T-30 torx key. Remove both original rings. Locate the new oval inner chainring with the triangular timing indicator positioned behind crank arm. The bolt holes on the small chainring are recessed – so the nut heads will sit flush with the surface of the chainring - these recesses should face you when mounting the bolts. Absolute Black outer chainrings have a specific recess to accommodate the rear edge of the crank arm - position the outer ring to line up that recess with the crank arm. If you are only switching the inner chainring to oval - use the original bolts that came with your crank. If you are switching to a pair of oval rings, you will need a set of regular ‘double’ chainring bolts. Tighten all four bolts with force of about 5-7Nm. Mount your crank back to the bike. You may also need to adjust the front derailleur upwards by 2-3mm.


    All Absolute Black products are designed in UK and manufactured in Poland (EU) to the highest standards of quality.


    Word on BIOPACE - Please understand Absolute Black’s oval design IS NOT ‘Biopace’ technology. Shimano created their non-round Biopace chainrings with a completely different orientation of the biggest radius of the oval. Their ring orientation has since been widely accepted as being fundamentally wrong. 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 physiology generates least power. The result was that in power zone pedalling was too easy and in dead zone too hard, causing knee pain and lumpy pedalling cadence. Exactly opposite to how it should be. The opposite of how it is with an Absolute Black oval chainring fitted to your bike.


    Cranks visible on the photos are not included to the purchased chainrings. 

    The World's finest oval (elliptical) road chainring. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings.

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