absoluteBLACK 1X Aero oval chainring road spiderless
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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.
Who will benefit from 1X Aero chainring for Sram cranks
- Size (Mass +/-1g): 50T (197g), 52T & 54TComing 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
- Finish: type II anodizing
- Ovality: 10.45% and Timing of 108.3° after TDC (top dead center) Patent Pending
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.
new aero shapes of golf ball that can be used in road racing
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.