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Zipp Cognition Hubset
Every time a conventional hubset starts to coast, friction within the freehub ratchet mechanism works like
a drum brake to slow the rider down. With the Cognition hubset’s Axial Clutch™ technology, Zipp reduced
this drag by disengaging the ratchet mechanism when coasting.
With less internal hub drag a rider can pedal less when drafting in a headwind, achieve higher speeds when
coasting in an aero tuck, or opt to stop pedaling a moment sooner before entering a corner and bank that
wattage for use exiting the corner.
Axial Clutch technology allows riders also to maintain speed through corners that don’t require braking
input, thereby increasing corner exit speeds. Inside the Axial Clutch mechanism they use magnets, rather
than steel springs, to move and engage our light weight Metal injection Molded (MIM) ratchet rings for
unmatched reliability and consistent operation. With 36 points of engagement that all interlock
simultaneously, there isn’t a more secure freehub mechanism on the market.
Their Axial Clutch freehub mechanism is also compatible with XD drivers. This gives riders the option to
select a 10-42 cassette to assemble a 1x11 drivetrain with an equivalent range to either a compact or
standard road double drivetrain.
A star-flanged straight-pull hubshell design on the rear hub distributes the load placed on the hub flange
away from the bearings.
Zipp have also developed a unique scalloped edge hubshell design for their front hub. This scalloped design
maintains the bearing bore diameter when high radial spoke tension is applied. Both of these hubshell
design elements ensure that bearings quietly stay in place, roll faster, last longer, and provide a laterally
stiffer hub. As regards the bearings, Zipp have chosen Swiss stainless steel bearings specially made to their
specs to provide the longest lasting, lowest friction performance available.