absoluteBLACK Road Chainring - Oval - 110mm / 4-Arm asymmetrical - Shimano 9100 / 8000 - black

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Description of absoluteBLACK Road Chainring - Oval - 110mm / 4-Arm asymmetrical - Shimano 9100 / 8000 - black

absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100, Ultegra 8000 & 105 R7000 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). 10/11/12spd compatible.

Features:

  • Size (Mass +/-1g): 34T (31g), 36T (37g), 38T (41g), 39T (42g), 50T (120g), 52T (137g), 53T(139g)
  • Compatibility: Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2 and Ultegra 8000, R8020, R8050 & 8070 Di2, 105- R7000, R7020, R7070. They can also retrofit all 9000 and 6800 series cranks but use bolt covers for best appearance. 10 / 11 / 12spd compatible.
  • Material: cnc machined 7075 tempered Aluminium. Long-lasting construction.
  • Finish: type II anodizing
  • Ovality: 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


Important

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 the Road Oval chainrings:

  • Finest design to provide excellent weight to strength ratio.
  • 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%

Why absoluteBLACK's oval chainrings work:

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.

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.

How to adjust front derailleur with absoluteBLACK Road Oval chainrings:

To proceed with the adjustment you will need 2mm and 5mm allen keys.

Trouble shooting:
  • If your derailleur overshifts the chain when moving from small ring to the big ring, it means your "gap" is greater than 2mm when chain is on big chainring (see video). You may need to reduce the gap. Your front derailleur may also be too high compared to what is advised on the video. Last thing to check is if your cage is parallel to the big chainring face.
  • If your front derailleur is hesitating to shift from small to the big ring then two issues may be present. The "gap" may be too small (It has to be 2mm - see video) or your cage is not parallel to the big chainring face.


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 absoluteBLACK Oval chainrings do not have adjustable timing

absoluteBlack 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 the oval chainring design, to reflect a single high performance ‘sweet-spot’, they were able to make the process of fitting Absolute Black oval chainrings faster and easier, as well as making the 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. Using small oval ring as a starting point is recommended. 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 110/4 9100 / 8000 Oval chainring: (same instruction as for 9000/6800 cranks)?

First, you need to remove your crank from your bike. Once removed, unscrew the 4 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 chainring has a specific shape of mounting tabs so it will only fit one way on 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 or absoluteBLACK set of Bolt covers. 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 slightly.



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Fact Sheet of absoluteBLACK Road Chainring - Oval - 110mm / 4-Arm asymmetrical - Shimano 9100 / 8000 - black

Product Name: absoluteBLACK Road Chainring - Oval - 110mm / 4-Arm asymmetrical - Shimano 9100 / 8000 - black
Manufacturer: absoluteBLACK
Item Code: ABB376629
Year: 2018
Material: aluminum 7075 tempered
Weight: approx. 31 gram (31 teeth) up to 139 grams (53 teeth)
manufacturer information)
Chainwheel, number of teeth: 34 | 36 | 38 | 39 | 50 | 52 | 53
Fitting for derailleur: 10-/11-/12-speed
Bolt Circle (mm): 110
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Selection: absoluteBLACK Road Chainring - Oval - 110mm / 4-Arm asymmetrical - Shimano 9100 / 8000 - black
Still 1 in stock in stock, delivery time 1-2 days Number of teeth 34
Currently not in stock Not deliverable Number of teeth 36
Currently not in stock Not deliverable Number of teeth 38
Still 1 in stock in stock, delivery time 1-2 days Number of teeth 39
Still 1 in stock in stock, delivery time 1-2 days Number of teeth 50
Currently not in stock Not deliverable Number of teeth 52
Currently not in stock Not deliverable Number of teeth 53
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