absoluteBLACK Oval Rotor 76BCD Chainring N/W

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Product Description

Our premium 1X Rotor 76bcd compatible Oval chainrings are designed for Rotor REX cranks with their original 1X spider. They are lighter and stiffer compared to the original chainring due to one optimized mounting position only. This enabled us to develop better performing chainring with super smooth pedaling sensation.

Size (Mass +/-1g):
30T (44g), 32T (49g), 34T(58g)

All ROTOR REX cranks with Rotor 76bcd spider (Not compatible with Sram 76bcd cranks) 9, 10, 11 and 12spd Eagle compatible.

CNC machined 7075 Txxx Aluminum. Long-lasting construction. Mud optimized.

Perfect 49mm

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 oval chainrings:
  • Finest design to provide excellent weight to strength ratio
  • Lighter than original Rotor chainrings.
  • 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
  • Superb quality and great look.
  • You will not "feel" the oval shape at all
  • Reduces stress on knees
  • Only one chainring position. We optimized this chainring for best performance, so adjustable timing is not needed making the installation easy .

What to expect when moving from Rotor chainring to absoluteBlack one
Almost all of our customers who tried Rotor before and now are using absoluteBlack, claim absoluteBlack chainrings deliver smoother pedaling sensation and allow them to pedal harder for longer. This derives from the fact that both companies have different objectives when designing the chainring. We focus on producing super smooth pedaling sensation that translates to higher cadence, increased speed, less stress on the knees and less tired legs after long ride. Rotor from the other hand focuses their efforts on theoretical gains in power and design their products with this in mind. While power gains are still not proven to this day; smoother pedaling is and you will be able to feel it yourself.

How to mount Rotor compatible Oval chainring:
It's very simple. You need to mount absoluteBlack chainring exactly the same way as you did with your original Rotor ring. There are four torx bolts that needs to be unscrewed. Remove old chainring and put new one in. Mount the screws back.

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.

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.

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.

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.

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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.