absoluteBLACK Oval 110BCD 4 Bolt 2X Asymmetric Shimano 9100/8000

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Product Description

absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100 & Ultegra 8000 only. These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. (They can be also retrofitted to 9000 and 6800 cranks).

Size (Mass +/-1g):
34T (31g), 36T (37g), 38T (41g), 39T (42g), 50T (120g), 52T (137g), 53T(139g) 

Shimano Dura-Ace 9100, R9150 Di2 and Ultegra 8000, R8050 Di2. They can also retrofit 9000 and 6800 cranks but use bolt covers for best appearance.

For Outer chainring please order "Long bolts" from us OR Bolt Covers

Changing Inner chainring to oval only? use original bolts

Material & Finis:
CNC machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing

Optimized to each size separately. 34T- 6.5% ; 36T, 38T, 39T- 11.4%, 50/52/53T - 10-11.2% ; Timing of 108 -110.5° after TDC (top dead center) - Ideal for road climbing. Patent Pending

Ramps on big rings are specially configured for combinations: 50/34, 52/36, 52/38, 53/39T

 If you wish to use other configuration it will also work, but shifting will be slower and may require more "adjustments" of front dérailleur to be acceptable. Also remember that front dérailleur can only accept max 16T difference between 2 chainrings - this is how Shimano and Sram designed them.

Advantages of Absolute Black Road Oval chainrings:
  • One of a kind special oval shape that helps you climb easier and faster (Patent Pending)
  • Over 15% stiffer than Rotor Qrings due to thicker, 5mm construction
  • Bespoke Absolute Black 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring
  • Finest design that provides excellent strength to weight ratio
  • You will not "feel" the oval shape while pedaling
  • Your pedaling action will feel smoother
  • Helps reduce stress on knees and helping your legs remain fresher for longer
  • You will be able to maintain better cadence while climbing
  • Reduces possibility of leg cramps
  • You will reduce chainring/cog shifts by at least 15%

What size should I choose?
34T inner chainring should be used with 50T outer ring. It has 6.5% ovality. Use a 34T to help with spinning higher cadence and hilly terrain.

36T inner chainring can be used with 50 or 52T outer ring. It has 11.4% ovality. Use a 36T if you’re a strong rider or for rolling terrain.

38T inner chainring should be used with 52T outer ring. It has 11.4% ovality. Use a 38T if you’re a very strong rider or for flat terrain.

39T inner chainring should be used with 53T outer ring. It has 11% ovality. Use a 39T if you’re a very strong rider or for flat terrain.

50T outer chainring – Choose this size if you ride for pleasure or sportive events. This is the most versatile and comfortable size.

52T outer chainring - if you race and feel strong, it's the classic outer chainring size and a great option for experienced riders.

53T outer chainring - if you race and feel very strong, it's the classic outer chainring size and a great option for powerful riders.

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.

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)

Why our oval chainrings work
Our premium Oval chainrings work because riders do not produce power evenly through a pedal stroke –the musculature of human legs makes it difficult to maintain an even power delivery to a round chainring. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. Oval rings work with the natural human physiology. Oval chainrings maximize the part of the stroke where power is produced and minimize resistance where it isn't. As a direct consequence, Oval rings enhance a cyclist’s ability to spin with a smoother power delivery and feel easier on legs while climbing. You will actually feel your pedal stroke to be more "round" with an Oval chainring than with a round chainring.

Why using AbsoluteBlack oval chainrings matters
Absolute Black oval road chainrings deliver power more smoothly to your rear wheel. This means you are better able to generate and maintain, constant cadence. Because oval chainrings reduce the peak loads on knee joints, riders using them get less stress on the joints (knees) and therefore are able to keep certain level of effort for longer. This results in higher average speed. You don’t need to take our word at Absolute Black; 11 scientific studies by leading universities around the globe show that; in comparison to round chainrings, when using oval chainrings, human legs utilize more muscle groups - but each of them to lesser degree. The overall Load from pedalling an oval chainring is spread over greater muscle mass. This has three key benefits; firstly, it gives you the feeling of fresher and more relaxed legs. Secondly; it allows you to achieve higher average speed riding uphill. Thirdly; spreading the pedalling load over more muscles reduces the risk of cramp, even when riding hard. The compound effect of switching to oval chainrings; the relaxed legs, added climbing ability and reduction of cramp means your overall enjoyment of the ride is enhanced.

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.

Occasionally, without notice, manufacturers change product design and/or specifications.

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Chainring Guide


Chainring Guide

Chainrings are the link between your cranks and your chain. They come in many different sizes and bolt patterns to match the many different types of cranks available. The larger a chainring, the harder the gear, and conversely, the smaller the chainring, the easier the gear.

Most modern mountain bikes now use just one chainring, knows as one by or 1x. Most road bikes use two chainrings, known as double or 2x. There are also triple or 3x setups available. Hybrid bikes can use either road or mountain bike gearing. In this guide, we will show the things to note when upgrading or replacing your chainrings. If not attached directly to the centre of the crankset axle, chainrings will mount to a spider. This spider can be different sizes depending on the crankset, known as BCD. The spider can also use different amounts of bolts to secure the chainring.

Narrow/Wide chainrings

Modern mountain bikes, many gravel bikes and now even some road bikes have only a single chainring. With the advent of very large cassettes, it is possible to get the range of gears once offered by a double chainring crankset with a single chainring setup.

There are many advantages to using only a single chainring. There is less weight as there is no need for a second chainring, a front derailleur, or a front shifter. There is also the practical advantage with fewer components there is less to go wrong or maintain. The key to a 1x drivetrain is the use of a narrow/wide chainring.

Narrow Wide Chainring

A narrow/wide chainring uses alternating narrow and wide teeth that grip the chain onto the chainring. This technology has almost eliminated dropped chains. Most riders will not use a chain device as the chain retention is so secure. Please note a narrow/wide chainring will only work with a 1x set up. The narrow/wide teeth that grip the chain will not allow the chain to shift to a second chainring. double and triple chainrings have ramps built in to aid with shifting.

Double and Triple Chainrings

Double and triple chainrings are specific to their use and include ramped sections around the ring that help guide the chain either up or down onto the next cog when pushed by the derailleur.

Some chainsets have one bolt area that mounts both chainrings with the same bolts. Others have one bolt area for the outer and another smaller bolt area for the inner chainring. When replacing, please ensure that the replacement is for a double or triple crankset to ensure compatibility, along with the correct BCD and amount of arms on the spider.

Double and Triple Chainrings

Oval Chainrings

Oval chainrings are designed to create a smooth power delivery and increase your pedalling effectiveness. Oval chainrings maximize the part of the stroke where power is produced and minimize resistance where it isn't. Riders who spend a lot of time climbing will feel the advantages of using an oval chainring.

Oval Chainrings

Riders that use a double chainset can use two oval chainrings or just the one. For example, some riders might want an oval outer ring with a standard round inner. It is recommended to purchase an oval chainring with the same teeth as your prefered round chainring. Again BCD and bolt count govern the compatibility of an oval ring with your crankset. Oval chainrings are now available in most common sizes.

BCD and Direct Mount

Before choosing your next chainring, you will need to know the BCD (sometimes known as PCD) and how the chainring is attached. Firstly look at how the chainring is attached, does it use bolts, if so how many. If it does not use bolts, then it will be a direct mount chainring.

Once you know the number of bolts then you will need to know the BCD of the chainring. BCD is the distance between the bolts, please also note if there is a symmetrical bolt pattern or an asymmetrical bolt pattern. For example, chainrings for a Shimano 105 R7000 road chainset use four-bolt asymmetrical 104 BCD chainrings.

BCD and Direct Mount

Direct mount chainrings do not use a spider or bolts to attach the chainring. The chainring mounts directly to compatible cranks. Each crank manufacturer has a different pattern to the direct mount spline and is unique to the manufacturer. For example, a RaceFace direct-mount chainring will only fit RaceFace cranks. A direct mount chainring cannot be mounted to a crank that does not support direct mount.

Delivery & Guarantee

UK Delivery Information

International Deliveries – Temporarily Suspended 11/11/20

Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey. 

Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.

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Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.

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Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause. 

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.