The lightest and most refined solution for Cannondale Hollowgram cranks, period. Hollowgram spiderless 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 "flat" ring offerings.


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.




USA, Canada and RoW Europe customers only UK customers only


We use UPS courier for UK/Europe. For USA/Canada/Rest of World we use National Post services.


. . . .

The lightest solution on the bicycle market – period.


Size (Mass +/-1g):

28T(55g), 30T(56g), 32T(57g), 34T(70g)


Black & Green


Cannondale Hollowgram Si, SiSL, SiSL2 and newest F-Si


cnc machined 7075 Txxx Aluminum. Long-lasting construction




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.


MSRP: £53,99 only ......


Designed in UK. Manufactured in Poland (EU).



Comparison chart:
XX1  spider + XX1 ring:    28T(69g),  30T(81g),  32T(84g),  34T(91g)  price on average: 150eur

AbsoluteBLACK chainring: 28T(55g),  30T(56g),   32T(57g),  34T(70g) price: 65eur


Always use correct chain length

Always use a new chain with a new chainring.

*Bypassing the rear derailleur, run the chain around front chainring/largest cog combination. (For the full suspension frame, position the rear suspension for the greatest chain length required. It's usually a normal position where rear shock if fully extended)

*Add 2 segments of the chain to this length for proper chain length.


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 medium 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.

while the shorter spindle only has 10mm spacer there