corona Premium 1X Oval Sram GXP Direct Mount

CORONA OVALE SRAM GXP DIRECT MOUNT

Corone ovale premium disegnate per Sram GXP e BB30 long spindle che montano uno spider removibile. le Corone spiderless Direct Mount sono compatibili con:
SRAM XX1, X01, X0, X9, X7, S2210, S1400 e Truvativ AKA cranks. GXP® and Long spindle BB30 models.

La forma del dente è ottimizzata per l'utilizzo con senglespeed, 1x9, 1x10, 1x11.
PESO:

• 26T (48g)
• 28T (50g)
• 30T (55g)
• 32T (59g)
• 34T (66g)

ABSOLUTEBLACK SRAM OVAL GXP® TRACTION CHAINRING

Our premium 1X Sram Direct mount Oval GXP® compatible traction chainrings are designed for GXP® and Long BB30 spindle cranks. Fits Sram 10/11spd XX1, X01, Eagle 12spd and others. Also replaces 76bcd chainrings to convert to direct mount solution.

• Size (Mass +/-1g): 26T (48g), 28T (50g), 30T (55g), 32T (59g), 34T(66g), 36T?(look at CX category)
• Color Black, Cannondale Green,  Racing Red, (Gold -coming soon)
• Compatibility SRAM XX1, XX1 Eagle, X01, X01 Eagle, X1-1400, GX-1400, X0, X9, X7, S2210, S1400 and Truvativ Descendant cranks. GXP® and Long spindle BB30 models (15mm spacer on drive side) 9-10-11-12spd.
• Material cnc machined 7075 Txxx Aluminum. Long-lasting construction. Mud optimized.
• Chainline perfect 49mm (improved)
• 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

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)
• Greatly improves traction and climbing abilities
• Unique Patent Pending alternate wide and narrow 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
• They save weight because they don't need the spider and chainring bolts.
• The ability of installation of a smaller ring sizes that can't be mounted on regular spider.
• 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.

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.

What size should I choose?

• 26T Oval chainring has the ovality of 24/28T and is best for someone who uses currently 26T round ring. (Fatbikes!)
• 28T Oval chainring has an ovality of 26/30T and is best for someone who uses currently 27 or 28T round ring.
• 30T Oval chainring has an ovality of 28/32T and is best for someone who uses currently 29 or 30T round ring.
• 32T oval ring will suit best someone who uses 31 or 32T chainring currently. While pedaling, you will feel similar effort to the one riding round 31T ring, but you will gain the speed similar to riding 34T chainring.
• 34T Oval chainring has an ovality of 32/36T and is best for someone who uses currently 33 or 34T round ring.
• 36T and bigger? Look at CX category for CX1 OVAL SRAM. It is same chainring just bigger sizes we advertise for Cyclocross

How to mount Sram GXP® and BB30 Oval chainring:

Guarda il video

You need to 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.
Instruction how to mount oval sram GXP chainring on the cranks of xx1, x01, x1, X9, X0, X7

It is ideal for 1x 9/10/11/12 system and Singlespeeds!. 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. Riding out of saddle on the uphill will become more pleasant. 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.

The most advanced, Patent Pending alternate wide and narrow teeth profile currently produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.

The World's best oval (elliptical) mtb spiderless traction chainring - period!. Non circular chainrings, Non-round chainrings. Asymmetrical 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.

Designed in UK. Manufactured in Poland (EU).

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):

26T: 118mm ; 28T: 127mm ; 30T: 134mm ; 32T: 143mm ; 34T: 151mm

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.

Other elliptical chainrings on the market

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.

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 slightly 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 exact figures about timing and ovality of the chainring as each one is special and we need to protect our Patent Pending solutions. Due to our Global popularity and success there are now more companies releasing "similar" products. But "similar" is not the same. Even very small change in parameters of the oval shape and timing gives entire different feeling and performance. We mastered our oval chainrings to perfection, so you can get best possible advantage from the oval/elliptical shape.

Proud to inform you that Silver World Champion Marek Konwa is using and testing our oval (elliptical) chainrings. Used also by World Champion Maja Wloszczowska and 2014 Europe Champion Silver medalist Blaza Klemencic.