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Absolute Black > Mountain chainrings > Round narrow-wide > Absolute Black Round Cannondale Hollowgram direct mount N/W chainring
Absolute Black
 

Absolute Black Round Cannondale Hollowgram direct mount N/W chainring

Item#PriceStock
28T black
#: CN28BK
Price: $104.99
Stock: Available
CN28BK$104.99Available
30T black
#: CN30BK
Price: $104.99
Stock: out of stock
CN30BK$104.99out of stock
32T black
#: CN32BK
Price: $104.99
Stock: Available
CN32BK$104.99Available
34T black
#: CN34BK
Price: $104.99
Stock: Available
CN34BK$104.99Available
28T green
#: CN28GN
Price: $104.99
Stock: Available
CN28GN$104.99Available
30T green
#: CN30GN
Price: $104.99
Stock: Available
CN30GN$104.99Available
32T green
#: CN32GN
Price: $104.99
Stock: Available
CN32GN$104.99Available
34T green
#: CN34GN
Price: $104.99
Stock: Available
CN34GN$104.99Available


Overview
Hollowgram direct mount chainrings allow for flawless 1x9/10/11 drivetrain setup. Reliable, extremely light, stiff and clean looking on the bike. Chainring's specific offset creates a lot better chainline compared to other offerings on the market.

Its specially designed narrow-wide tooth profile keeps the chain really snug, allowing you to leave your chainkeeper in the garage. 

The most advanced, Patent Pending tooth profile on the Market guarantee minimum 12 months of excellent chain retention capabilities! We mean it. You can finally take your chainkeeper off of the bike. Tested by XC Silver World Champion Marek Konwa.

Specs

Size (Mass +/-1g): 28T(55g), 30T(56g), 32T(57g), 34T(70g)
Color: Black,  Green
Compatibility: Cannondale Hollowgram Si, SiSL, SiSL2 and newest F-Si
Material: cnc machined 7075 Txxx Aluminum. Long-lasting construction
Finish: anodized
Chainline: 47-50mm (5.7mm offset). Chainline depends on the length of the axle you use and spacers configuration.
Tooth Shape: Can be used with singlespeed, 1x9, 1x10 and 1x11 as it fits all chains. Tooth shape optimized for quiet work.

Hollowgram direct mount chainrings allow for flawless 1x9/10/11 drivetrain setup. Reliable, extremely light, stiff and clean looking on the bike. Chainring's specific offset creates a lot better chainline compared to other offerings on the market.

Its specially designed narrow-wide tooth profile keeps the chain really snug, allowing you to leave your chainkeeper in the garage. 

The lightest and most refined premium Round chainring for Cannondale Hollowgram cranks.

 
More info

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.

Round rings do not optimize the way humans produce power

Other elliptical chainrings
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. Please note: 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 a bit 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 information about timing and exact ovality of the chainring as each one is different.

 

Mounting instruction:

Generously grease the waved shape of the crank arm, then put the chainring so that fits completely(convex side to the crank arm). Put small amount of 17px strength Loctite on the lockring threads and tighten it with torque of about 47-54 Nm.

You will need "Cannondale Hollowgram Spider Removal Tool KT012" or similar to open and close the lockring. 

Comparison chart:

XX1 spider + XX1 ring: 28T(69g), 30T(81g), 32T(84g), 34T(91g)
AbsoluteBLACK chainring: 28T(55g), 30T(56g), 32T(57g), 34T(70g)

 
 
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