HOLLOWcage® for Shimano 9100 / 8000. Ourrevolutionary mono-plate OSPW design is the quietest, best shifting,aerodynamic derailleur cage design created to date. It is a dawn of new era forrear derailleurs. HOLLOWcage ® OSPW has a carbon-polymer mono-plateconstruction with bespoke, oversized, full ceramic bearings and the mostadvanced silencing pulleys ever created.
FLEXIBLE OSPW CAGE IS BETTER THAN ASTIFF ONE.
Contrary to common knowledge, flexibilityis good as it allows the cage (and therefore lower pulley) align better withthe angle of the chain when using the higher gears of the cassette. This meansless friction (and less Watts lost) as the pulley doesn’t have to fight againstthe chain itself. Shimano has partially solved this issue by bending the lowerpart of the cage slightly outwards, to align better with the chain when usingtop of the cassette range. We have taken a different approach and eliminatedone part of the cage all together, creating mono plate cage that candynamically adapt to the chain angle.
STIFFER GUIDE PULLEY, NOT CAGE, MEANSBETTER SHIFTING.
Many companies try to convey that a stiffercage is a better shifting cage. But the single most important factor thatimpacts the shifting is the upper pulley itself. Since the upper pulley ismounted directly to the rotating pivot axle, the flexibility of the cage playsvery little role. It’s the upper pulley that moves the chain left and right enablinggear change, so making the upper pulley really stiff allows for greatershifting precision. Most oversized pulley cage systems use very small bearings,with a lot of lateral play at the teeth which in turn provide poor, sloppyshifting. HOLLOWcage®, unlike other pulley cage systems, use abnormally large,bespoke, full ceramic bearings that make the pulleys incredibly stiff. Lowerbearing alone is actually big enough to fit 11T pulley inside of it.
THE PROBLEM OF SHALLOW TEETH.
One of the main shifting issues, apart frompulley stiffness alone, stems directly from the low teeth profiles. Low teethsimply can’t move the chain effectively left or right when you change gear.They are the only points of contact with the chain, but for some bizarrereason, majority of oversized pulley systems come with very shallow teethprofiles. This is the major contributing factor to oversized pulley cagesshifting badly. HOLLOWcage® uses very tall teeth of the upper pulley whichgives the best possible shifting precision.
OVERSIZED OSPW CAGE IS ACTUALLY MOREAERO.
There is a general belief among some of theriders that oversized cages are less aerodynamic. Their larger surface area,when compared to OEM cages, must result in some power losses, which wouldoffset the gains generated by the bigger pulleys. We have tested the marketleading cage as well as original Dura-Ace cage in a bespoke wind tunnel,designed for smaller objects. HOLLOWcage® proved to be more aerodynamic thanthe OEM (DA cage) as well as the other leading brand.
THE GAME OF WATT SAVING.
There are four main components to thesavings that oversized pulley system can provide. Bearing quality and itslubrication, the number of teeth in the pulleys, the cage spring tension andthe ability of the lower part of the cage to align with the chain. We are usingbespoke, shielded, oversized full ceramic bearings that are actually lightlygreased not oiled (nor dry). The difference between special grease and oil isonly 0.04W in real life conditions, under load, despite the fact that onepulley can free spin and another not at all with no load present. What we gainis great durability and reliability at a cost of 0.04W. Bearings, contrary tocommon assumption, are not the place of big savings (0.03-0.1W between ahigh-quality bearings). It’s the companies that sell them want you to thinkthey are by comparing them to Acera level pulleys.
SPECIFICATIONS
Size (Mass +/-1g): 71g
Color: Lower lockring: PVD Rainbow, Black,Titanium, Red, Gold
Compatibility: Shimano Dura Ace 9100 / 9150/ 9170 , Ultegra 8000 / 8050. Fits up to 32T cassette.
Materials used: Carbon fiber-polymermatrix, 7075 Aluminium, rubber, ceramics
In the box: Complete cage, lockring tool,2x spare xring rubbers
